{"title":"Alkalische Vorreiniger","description":"\u003ch2 id=\"speakable-headline\"\u003eAlkalische Vorreiniger\u003c\/h2\u003e\n\u003cp id=\"speakable-definition\"\u003e\u003cstrong\u003eAlkalische Vorreiniger\u003c\/strong\u003e: Alkalische Vorreiniger lösen passende Fett- und Straßenfilme an. Die alkalische Rezeptur wird nach organischer Verschmutzung und Materialverträglichkeit gewählt; sie ist nicht pauschal für jede Oberfläche geeignet.\u003c\/p\u003e\n\u003cp\u003eDie Vorwäsche verringert die Schmutzlast für den anschließenden Kontakt mit Waschhandschuh oder Waschpad.\u003c\/p\u003e","products":[{"product_id":"koch-chemie-copo-star-bmp-t-cst-vorreiniger","title":"Copo Star BMP-T \"Cst\" Pre-Cleaner","description":"\u003ch2\u003eShifting baked-on industrial grime — with the Koch-Chemie Copo Star BMP-T \"Cst\" Pre-Cleaner\u003c\/h2\u003e\n\n\u003cblockquote\u003e\u003cem\u003eThe Koch-Chemie Copo Star BMP-T \"Cst\" is a highly concentrated, alkaline pre-cleaner for shifting oil, grease and operating residue off vehicles, machinery and industrial surfaces — by hand or machine. It's built to run before your actual wash step, for the kind of grime that leaves standard cleaners standing.\u003c\/em\u003e\u003c\/blockquote\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-alkaline pre-cleaner\u003c\/strong\u003e — concentrated power against baked-on oil, grease and soot that shrugs off standard alkaline cleaners.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePre-treatment before the main wash\u003c\/strong\u003e — loosens stubborn deposits first, so the cleaning step that follows (e.g. with Cosmo-Clean) can actually get to work.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFor trade users\u003c\/strong\u003e — built for workshops, vehicle prep and industrial cleaning, not for home use.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n\u003ch3\u003eWhy you'd reach for a pre-cleaner like the Copo Star BMP-T\u003c\/h3\u003e\n\u003cp\u003eIn commercial vehicle and machinery care there's grime a single cleaning pass simply won't fully shift: baked-on engine oil on blocks, hydraulic oil films under vehicle bodies, old grease build-up on axles and running gear, or the soot film that piles up on commercial vehicles over time. The \u003cstrong\u003eCopo Star BMP-T \"Cst\"\u003c\/strong\u003e is designed for exactly this class of job. The high-alkaline pH breaks down polymerised greases and oils that heat has baked onto metal surfaces. You lay the Copo Star BMP-T down before the actual wash step and let it dwell — it breaks the bond between the grime and the surface underneath, so the main wash that follows runs far more efficiently.\u003c\/p\u003e\n\n\u003ch3\u003eHow to use it and how to dose — getting the pre-cleaner right\u003c\/h3\u003e\n\u003cp\u003eSpray or apply the Copo Star BMP-T neat or lightly diluted, depending on how heavy the grime is. Watch the dwell time — anywhere from 3 to 10 minutes depending on temperature and how dirty the surface is. Then work it off with a pressure washer or brush. Don't use it on hot surfaces, and keep it out of direct sun while it dwells. Not suitable for painted surfaces — the high pH can attack paint and coatings. Protective gear (gloves, eye protection) is a must when you handle it.\u003c\/p\u003e\n\n\u003cblockquote class=\"praxistipp\"\u003e\n  \u003cp\u003e\u003cstrong\u003eDetailing1's tip from the shop:\u003c\/strong\u003e Never use the Copo Star BMP-T on a warm engine or in the midday sun — the product flashes off faster and the dwell time shortens on you uncontrollably. Best results at room temperature or on slightly pre-warmed surfaces (hand-warm). After rinsing, follow up with Cosmo-Clean \"Cc\" to neutralise any leftover residue from the alkaline pre-cleaner.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\n\u003ch3\u003eCopo Star BMP-T vs. Green Star — which one for which job?\u003c\/h3\u003e\n\u003cp\u003eWhere the Koch-Chemie Green Star BMP is a versatile all-rounder for moderate to medium grime, the Copo Star BMP-T is built for the extreme stuff the Green Star can't handle. Rule of thumb: if the Green Star won't get you clean in two passes, reach for the Copo Star as a pre-cleaner. After the Copo Star BMP-T, always finish with a milder cleaner to fully remove any residue from the alkaline cleaner.\u003c\/p\u003e\n\n\u003ch3\u003eWho's the Copo Star BMP-T right for?\u003c\/h3\u003e\n\u003cp\u003eFor workshops, vehicle prep outfits and industrial operations that regularly clean heavily soiled vehicles or machinery. The 10 kg container is sized for trade use. It's not suitable for home users — the high pH calls for know-how when handling it and is approved for trade users only.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003cdiv itemscope itemtype=\"https:\/\/schema.org\/FAQPage\"\u003e\n\n  \u003ch2\u003eFrequently asked questions about the Copo Star BMP-T \"Cst\" Pre-Cleaner\u003c\/h2\u003e\n\n  \u003cdiv itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n    \u003ch3 itemprop=\"name\"\u003eWhat is the Copo Star BMP-T \"Cst\" and what's it used for?\u003c\/h3\u003e\n    \u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\n      \u003cp itemprop=\"text\"\u003eThe Copo Star BMP-T is a high-alkaline pre-cleaner for the trade removal of baked-on oil, grease and operating residue on vehicles, engines and machinery. You use it as a prep step before the main wash, to loosen stubborn deposits that standard cleaners can't shift.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n    \u003ch3 itemprop=\"name\"\u003eHow do you use the Copo Star BMP-T?\u003c\/h3\u003e\n    \u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\n      \u003cp itemprop=\"text\"\u003eApply it neat or lightly diluted to a cold or hand-warm surface, let it dwell for 3–10 minutes, then rinse off with a pressure washer or brush. Don't use it on painted or hot surfaces. Protective gear (gloves, eye protection) is a must.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n    \u003ch3 itemprop=\"name\"\u003eCan the Copo Star BMP-T be used on paint?\u003c\/h3\u003e\n    \u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\n      \u003cp itemprop=\"text\"\u003eNo — the high pH of the Copo Star BMP-T isn't paint-safe. The product is only suitable for unpainted metal, chassis and engine surfaces. For cleaning painted surfaces, milder products like the Green Star BMP or dedicated vehicle cleaners are the right call.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n    \u003ch3 itemprop=\"name\"\u003eWhat's the difference between the Copo Star BMP-T and the Green Star BMP?\u003c\/h3\u003e\n    \u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\n      \u003cp itemprop=\"text\"\u003eThe Green Star BMP is an all-purpose cleaner for moderate to medium grime across a wide range of surfaces. The Copo Star BMP-T is a pre-cleaner for extreme grime — baked-on oils and greases — that leaves the Green Star standing. The Copo Star is more aggressive and therefore limited to unpainted, robust surfaces.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n    \u003ch3 itemprop=\"name\"\u003eIs the Copo Star BMP-T suitable for home users?\u003c\/h3\u003e\n    \u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\n      \u003cp itemprop=\"text\"\u003eNo — the Copo Star BMP-T is approved for trade users only. The high pH calls for know-how to handle safely, plus the right protective gear. For home users tackling cleaning jobs around the house and yard, milder products are the safer choice.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Koch-Chemie","offers":[{"title":"10kg","offer_id":48762157203791,"sku":"D1-KCX-52010","price":62.99,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/koch-chemie-copo-star-bmp-t-cst-vorreiniger_10kg.png?v=1714739492"},{"product_id":"koch-chemie-pre-foam-efficient-pfe-vorreiniger-insektenloeser","title":"Pre-Foam efficient \"Pfe\" Pre-Cleaner \u0026 Insect Remover","description":"\u003ch2\u003e\u003cstrong\u003eKoch-Chemie Pre-Foam efficient \"Pfe\" — Pre-Cleaner \u0026amp; Insect Remover\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eKoch-Chemie Pre-Foam efficient \"Pfe\"\u003c\/strong\u003e is a hard-hitting, phosphate-free, strongly alkaline \u003cstrong\u003epre-cleaner and insect remover\u003c\/strong\u003e built for the pre-wash on cars and trucks. With a mix of powerful chelating agents and surfactants, this foam cleaner cuts through stubborn grime like bug splatter, bird droppings and road film without a fight. It foams beautifully and carries a fresh citrus scent, so the wash actually feels good. \u003cstrong\u003eVDA-compliant Class B\u003c\/strong\u003e: maximum dwell time 1 minute, maximum use concentration 1:100.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSerious efficiency:\u003c\/strong\u003e Lifts stubborn grime fast and reliably.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePleasant scent:\u003c\/strong\u003e Fresh citrus smell for a cleaning job that doesn't reek.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile use:\u003c\/strong\u003e Works on cars, trucks and self-service wash bays.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eEffective insect cleaning\u003c\/h3\u003e\n\u003cp\u003eThe Pre-Foam efficient \"Pfe\" really shines when it comes to \u003cstrong\u003einsect cleaning\u003c\/strong\u003e. At a 1:20 dilution it pulls bug splatter off the bodywork without scrubbing. Just lay it on from the bottom up and rinse off with a pressure washer after a minute, tops. No grime left behind, and the car comes up looking fresh.\u003c\/p\u003e\n\u003ch3\u003eCar chassis pre-cleaning\u003c\/h3\u003e\n\u003cp\u003eFor \u003cstrong\u003ecar chassis pre-cleaning\u003c\/strong\u003e the Pre-Foam efficient is bang on. A 1:30 dilution is enough to clear out dirt and build-up properly. Cover the whole area, give it a short dwell, then rinse the cleaner off thoroughly. That gets you a deep clean and sets the chassis up nicely for the main wash.\u003c\/p\u003e\n\u003ch3\u003eTruck pre-cleaning\u003c\/h3\u003e\n\u003cp\u003eA \u003cstrong\u003etruck pre-wash\u003c\/strong\u003e asks a lot, and the Pre-Foam efficient handles it no problem. At 1:15 to 1:20 it shifts even baked-on grime fast and effectively. Lay it on from the bottom up across the whole surface and rinse after a minute at most. Saves time and leaves a cracking result.\u003c\/p\u003e","brand":"Koch-Chemie","offers":[{"title":"2x 5 liters","offer_id":54576928227663,"sku":"D1-KCX-461005_2","price":39.18,"currency_code":"EUR","in_stock":true},{"title":"5 liters","offer_id":48762510344527,"sku":"D1-KCX-461005","price":19.99,"currency_code":"EUR","in_stock":true},{"title":"20 liters","offer_id":49437026910543,"sku":"D1-KCX-461020","price":65.49,"currency_code":"EUR","in_stock":true},{"title":"200 liters","offer_id":49437026943311,"sku":"D1-KCX-461200","price":700.99,"currency_code":"EUR","in_stock":false},{"title":"1000 liters","offer_id":49437026976079,"sku":"D1-KCX-461000","price":3310.99,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/koch-chemie-pre-foam-efficient-pfe-vorreiniger_5L.png?v=1714926799"},{"product_id":"koch-chemie-pre-wash-b-pb-vorreiniger","title":"Pre-Wash B \"Pb\" Pre-Cleaner \u0026 Bug Remover","description":"\u003cp\u003eThe highly concentrated, phosphate-free, strongly alkaline pre-cleaner for the pre-wash on cars and trucks. A high load of complexing agents, surfactants and special additives breaks loose even the most stubborn grime on contact — bug splatter, bird droppings, road film and brake-dust build-up — which makes it ideal for wash lines with short dwell times (express tunnels, for example) and for alkaline wash-bay cleaning. It's also built for biological grey-water treatment.\u003c\/p\u003e","brand":"Koch-Chemie","offers":[{"title":"11kg","offer_id":57635641164111,"sku":"D1-KCX-313011","price":56.99,"currency_code":"EUR","in_stock":true},{"title":"23 kg","offer_id":57635641327951,"sku":"D1-KCX-313023","price":97.49,"currency_code":"EUR","in_stock":true},{"title":"225kg","offer_id":57635623567695,"sku":"D1-KCX-313225","price":1001.99,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/koch-chemie-pre-wash-b-pb-vorreiniger_11kg.png?v=1714927131"},{"product_id":"koch-chemie-vorreiniger-b-vb-vorreiniger","title":"Vorreiniger B \"Vb\" Pre-Cleaner","description":"\u003ch2 id=\"speakable-headline\"\u003eThe alkaline pre-wash with the Koch-Chemie Vorreiniger B\u003c\/h2\u003e\n\n\u003cblockquote id=\"speakable-summary\"\u003e\n  \u003cp\u003e\u003cem\u003eThe Koch-Chemie Vorreiniger B is a highly concentrated alkaline pre-cleaner at pH 13.1 for the touchless vehicle pre-wash. Phosphate-free, VDA-compliant in Class A and B, fast-separating to ÖNORM 5106 and packing corrosion inhibitors for anodised aluminium. Not a mild snow foam for active coatings — a workshop-grade alkaline cleaner for real dirt.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\n\u003chr\u003e\n\n\u003cp id=\"speakable-definition\"\u003e\u003cstrong\u003eKoch Chemie Vorreiniger B\u003c\/strong\u003e is a high-alkaline pre-cleaner concentrate from Koch-Chemie in Unna that chemically lifts insects, bird droppings, road grime and wheel soiling before the actual car wash. At pH 13.1, this pre-cleaner sits in the professional segment between a medium-strength foam pre-cleaner and an industrial alkaline cleaner. The mix of powerful chelating agents and special surfactants tackles organic and inorganic deposits at the same time — exactly what high-throughput wash tunnels and vehicle detailers need.\u003c\/p\u003e\n\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/d1_koch-chemie-vorreiniger-b-vb-vorreiniger_hero.jpg?v=1776198373\" alt=\"Koch-Chemie Vorreiniger B Vb in the Detailing1 warehouse\" loading=\"lazy\" style=\"width:100%;height:auto;display:block;margin:1.5em 0;\"\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003epH 13.1 pulls off insects and brake dust in one pass.\u003c\/strong\u003e The blend of chelating agents and special surfactants works on organic deposits like insect splatter and bird droppings as well as on inorganic wheel soiling at the same time. One product replaces two steps — and that saves time, water and product.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVDA-compliant in Class A and B.\u003c\/strong\u003e One of the few pre-cleaners with a double VDA rating: 1:300 with up to 5 minutes dwell time (Class A) or 1:30 with a maximum of 1 minute (Class B). Wash line and hand wash covered with a single product.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCorrosion inhibitors for anodised aluminium.\u003c\/strong\u003e The inhibitors protect sensitive parts despite pH 13.1 — which matters for vehicles with visible aluminium components, alkali-resistant painted alloy wheels and chrome trim.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003cblockquote class=\"praxistipp\"\u003e\n  \u003cp\u003e\u003cstrong\u003eDetailing1's tip from the shop:\u003c\/strong\u003e Never lay the Vorreiniger B down on hot or sun-warmed surfaces. Above 30 degrees paint temperature the cleaner flashes off before the dwell time is up — leaving dull streaks that only come off with polish. Before you start, move the vehicle into the shade or rinse it down with cold water first. In full summer sun, reach for the milder Pre-Foam efficient instead, which is far more forgiving with its 1-minute maximum dwell time.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e1:30 for insects. 1:300 for high pressure.\u003c\/h3\u003e\n\u003cp\u003eDilution depends on how dirty the vehicle is and how you apply it. 1:30 to 1:50 for the pre-wash, 1:3 to 1:10 for heavily soiled wheels, 1:300 for self-service high-pressure units.\u003c\/p\u003e\n\u003cp\u003eFor the touchless pre-wash with a foam lance you work at 1:30 to 1:50. One litre of concentrate at 1:50 gives you 51 litres of ready-to-use solution — enough for roughly 20 to 25 cars in standard exterior care.\u003c\/p\u003e\n\u003cp\u003eThe foam lance should run at 0.8 to 1.2 litres per minute flow so the foam consistency is right and the cleaner clings to vertical panels long enough to do its job. Apply the pre-cleaner from the bottom up onto the cold, pre-wetted vehicle — that way you avoid run marks on unevenly dried panels. After 5 minutes dwell time at most (VDA Class A), rinse off thoroughly with the pressure washer.\u003c\/p\u003e\n\u003cp\u003eIn self-service wash bays, 1:300 is enough — that's the high-volume dilution and it cuts product use noticeably over a full year. For wheel cleaning you work at 1:3 to 1:10, sprayed straight onto the cold dry wheel, left to dwell for 1 minute at most, then rinsed. Important: don't use it on hot brake discs or warm wheels. The heat speeds up the reaction in an uncontrolled way and raises the risk of dulling on painted alloy wheels.\u003c\/p\u003e\n\u003cp\u003eFor wash tunnels with conveyor lines you typically run 1:100 to 1:200. Dwell time in the tunnel is usually 30 to 60 seconds, which still keeps you safely inside the VDA-B limit of 1 minute. The higher dilution cuts foam volume at the spray arch but keeps enough cleaning power thanks to the high active-ingredient concentration. With high vehicle throughput it pays to switch to the 225 kg container — a better price per litre of concentrate.\u003c\/p\u003e\n\u003cp\u003eFor copolymer de-waxing — stripping old preservatives before a fresh sealant — 1:5 to 1:10 is the right dilution. The Koch Chemie Vorreiniger B reliably lifts polymerised wax layers. That's a step many other alkaline \u003ca href=\"\/collections\/vorreiniger\"\u003epre-cleaners\u003c\/a\u003e don't cover. After that the paint can go straight to a fresh \u003ca href=\"\/collections\/versiegelungen\"\u003esealant\u003c\/a\u003e — saving a separate de-waxing step with IPA or silicone remover.\u003c\/p\u003e\n\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/d1_koch-chemie-vorreiniger-b-vb-vorreiniger_anwendung.jpg?v=1776198374\" alt=\"Koch-Chemie Vorreiniger B applied with a foam lance in the warehouse\" loading=\"lazy\" style=\"width:100%;height:auto;display:block;margin:1.5em 0;\"\u003e\u003c\/p\u003e\n\n\u003ch3\u003eWhere the workshop-grade alkaline cleaner stops. No snow foam replacement.\u003c\/h3\u003e\n\u003cp\u003eThe Koch Chemie Vorreiniger B is not a mild foam pre-cleaner for coating-protected vehicles. pH 13.1 is workshop level — strong, uncompromising, but sensitive in use.\u003c\/p\u003e\n\u003cp\u003eIts strength is on heavily soiled vehicles with insect, bird-dropping and road residue after a long motorway run or after winter. It also works reliably on baked-on brake dust on steel wheels and on alkali-resistant painted alloy wheels. The foam is functional — not the show foam you get from classic snow-foam products, but a working foam that clings to vertical panels.\u003c\/p\u003e\n\u003cp\u003eNow the honest read on the limits. First, the Vorreiniger B is not friendly to active ceramic coatings. Used regularly on coating-protected vehicles it breaks the coating down faster than a pH-neutral pre-wash foam does. For vehicles with an active coating, the milder Pre-Foam efficient is the better call. Second, don't use it on polished aluminium or chrome surfaces — despite the corrosion inhibitors, pH 13.1 can dull untreated light metals. The inhibitors protect anodised alloy, not bare alloy.\u003c\/p\u003e\n\u003cp\u003eThird: it is not paint-surface gentle in the sense of a hand-wash chemistry. If you look after your new car with the two-bucket method and a mild car shampoo, you don't need a Vorreiniger B in the garage. Its job starts where hand washing no longer cuts it — on heavily soiled vehicles, commercial fleets, utility vehicles and construction machinery.\u003c\/p\u003e\n\u003cp\u003eProtective gear is a must, not optional. Nitrile gloves and safety glasses when mixing and applying. On skin contact, rinse straight away with plenty of water and remove residue with mild soap. Never leave the concentrate bottle open — the fumes from the alkaline cleaner irritate airways and mucous membranes on longer exposure. Close it well after use and store it frost-free and dark.\u003c\/p\u003e\n\u003cp\u003eThe material compatibility of the Vorreiniger B has clear limits. Allowed: steel, anodised aluminium, alkali-resistant painted surfaces, glass and standard automotive plastics. Not allowed: polished light metals, bare chrome surfaces, coloured anodised layers (risk of discolouration) and matt-painted surfaces without a protective film. When in doubt, test on an inconspicuous spot before the first application and watch it for 3 minutes — it costs little time and saves expensive damage.\u003c\/p\u003e\n\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/d1_koch-chemie-vorreiniger-b-vb-vorreiniger_ergebnis.jpg?v=1776199899\" alt=\"Koch-Chemie Vorreiniger B workshop-grade alkaline cleaner pH 13.1\" loading=\"lazy\" style=\"width:100%;height:auto;display:block;margin:1.5em 0;\"\u003e\u003c\/p\u003e\n\n\u003ch3\u003eWho the Vorreiniger B is for — from the pro to the home garage\u003c\/h3\u003e\n\u003cp\u003eThe Koch Chemie Vorreiniger B is built for pros and experienced home users with know-how in alkaline chemistry. For beginners without protective gear and experience it's not the right choice.\u003c\/p\u003e\n\u003cp\u003eFor wash lines, vehicle detailers, workshops and self-service bay operators it's a standard tool. The 22 kg and 225 kg containers cover commercial demand. The 5 kg, 11 kg and 1 litre versions are aimed at single users, smaller workshops and experienced private buyers with their own high-pressure kit.\u003c\/p\u003e\n\u003cp\u003eThe 1-litre container is the right way in to test the product and the dilution on your own vehicle before moving up to larger quantities. The first time you mix it, work with a calibrated measuring jug — go by eye and most beginners land far too concentrated, which loads the material needlessly and encourages streaking.\u003c\/p\u003e\n\u003cp\u003eIf you want a mild, coating-friendly pre-wash foam, you're better off with the Pre-Foam efficient. If you supply express wash lines with extremely short dwell times, reach for the Pre-Wash B. If you need the strongest cleaner for baked-on oil and grease residue on engines and chassis, take the Copo Star BMP-T. The Vorreiniger B is the all-round middle of the \u003ca href=\"\/collections\/koch-chemie\"\u003eKoch-Chemie range\u003c\/a\u003e — phosphate-free, double VDA-compliant, fast-separating to ÖNORM 5106 and therefore also approved for biological process-water treatment systems.\u003c\/p\u003e\n\u003cp\u003eAnd that last point is the real Detailing1 insight. Workshops with an oil separator have a chronic problem with alkaline pre-cleaners. Many products form stable emulsions that overload the separator or tip the wastewater limits.\u003c\/p\u003e\n\u003cp\u003eThe Vorreiniger B is tested as fast-separating to ÖNORM 5106. The emulsion breaks down again in the separator within the standard conditions, and oil and water split cleanly. If you work in a commercial setting and have to keep an eye on your wastewater requirements, the Koch Chemie Vorreiniger B gives you an alkaline chemistry that won't become a problem at the plant — a detail neither the product page nor competitor copy bothers to mention.\u003c\/p\u003e\n\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/d1_koch-chemie-vorreiniger-b-vb-vorreiniger_lineup.jpg?v=1776198373\" alt=\"Koch-Chemie Vorreiniger B Vb full range from 1 litre to 225 kg\" loading=\"lazy\" style=\"width:100%;height:auto;display:block;margin:1.5em 0;\"\u003e\u003c\/p\u003e\n","brand":"Koch-Chemie","offers":[{"title":"1000ml","offer_id":49515037360463,"sku":"D1-KCX-283001","price":6.99,"currency_code":"EUR","in_stock":true},{"title":"2x 1000 mL","offer_id":49725492592975,"sku":"D1-KCX-283001_2","price":13.7,"currency_code":"EUR","in_stock":true},{"title":"3x 1000 mL","offer_id":49725492625743,"sku":"D1-KCX-283001_3","price":20.34,"currency_code":"EUR","in_stock":true},{"title":"5kg","offer_id":48762940162383,"sku":"D1-KCX-283005","price":22.99,"currency_code":"EUR","in_stock":true},{"title":"11kg","offer_id":48762938851663,"sku":"D1-KCX-283011","price":47.49,"currency_code":"EUR","in_stock":true},{"title":"22kg","offer_id":49603231646031,"sku":"D1-KCX-283022","price":88.49,"currency_code":"EUR","in_stock":true},{"title":"225kg","offer_id":49603231678799,"sku":"D1-KCX-283225","price":972.99,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/koch-chemie-vorreiniger-b-vb-vorreiniger.png?v=1727529718"},{"product_id":"sonax-profiline-multiclean-alkaline-vorreiniger","title":"PROFILINE MultiClean \"Alkaline\" Pre-Cleaner","description":"\u003ch2\u003eBreak heavy traffic film chemically — with the SONAX PROFILINE MultiClean Alkaline\u003c\/h2\u003e\n\n\u003cblockquote\u003e\n  \u003cp\u003e\u003cem\u003eWhat can the SONAX PROFILINE MultiClean Alkaline do? The high-alkaline pre-cleaner pulls bug splatter, heavy brake-dust deposits and organic road grime off the surface during the touchless pre-wash step — before the main wash even starts.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\n\u003chr\u003e\n\n\u003cp\u003eProper car care doesn't start with shampoo. If you want a genuinely clean wash, you set up first — with a pre-cleaner that breaks the worst of the dirt chemically, before any sponge or wash mitt ever touches the paint. That's exactly the thinking behind the \u003cstrong\u003eSONAX PROFILINE MultiClean Alkaline\u003c\/strong\u003e: a high-alkaline pre-cleaner that loosens bug splatter, organic road film, tar particles and heavy brake-dust deposits in the pre-wash, so the contact-wash risk to your paint drops noticeably during the shampoo pass that follows. It's built for pros and for keen hobby detailers who take their wash routine seriously.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-alkaline formula for maximum dirt break-down in the pre-wash step.\u003c\/strong\u003e The MultiClean Alkaline runs at a strongly alkaline pH that attacks organic grime — bugs, pollen, bird droppings, road film and greasy deposits — on a chemical level and weakens its grip on the surface. The dirt then rinses off touchless with the pressure washer or in the shampoo pass, instead of getting dragged across the paint while you wash and risking fine scratches.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePre-wash as paint protection — not just a convenience step.\u003c\/strong\u003e Every dirt particle still sitting on the surface when you start the contact wash acts like an abrasive. The pre-cleaner in the first step cuts the amount of grime on the surface before mitt or sponge come into play — that's not optional luxury, it's real long-term paint protection, especially on dark cars where micro-scratches show up the most.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlexible dosing — for different soiling levels and application methods.\u003c\/strong\u003e The MultiClean Alkaline comes in 1-litre and 5-litre containers and can be run at different strengths depending on how dirty the car is and how you apply it (foam cannon, spray bottle, pump sprayer). Light soiling needs a stronger dilution; on cars back from long motorway runs or in the summer bug season, you crank the concentration up.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003cblockquote class=\"praxistipp\"\u003e\n  \u003cp\u003e\u003cstrong\u003eDetailing1's tip from the shop:\u003c\/strong\u003e Always lay the MultiClean Alkaline down on a dry, cool car — not in full sun and not on pre-wetted paint, since water thins out the working concentration. Let the cleaner dwell for 2–5 minutes without letting it dry on — in hot weather or direct sun, shorten the dwell time and keep the car damp. Then rinse thoroughly with the pressure washer before you go into the shampoo pass. For maximum bug removal, run the cleaner stronger across the front end (grille, bumper) and, if needed, work it briefly with a soft brush before you rinse.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eAlkaline car pre-cleaner — how the MultiClean Alkaline works chemically\u003c\/h3\u003e\n\u003cp\u003eMost of the organic dirt on a car — bug splatter, pollen, bird droppings, the fatty salts off road wear, oil film — is stable in the acidic-to-neutral pH range. A high-alkaline cleaner like the \u003cstrong\u003eSONAX PROFILINE MultiClean Alkaline\u003c\/strong\u003e shifts the chemical balance: esters and fatty compounds in organic grime are split apart by saponification under alkaline conditions, protein structures in bug residue are denatured and dissolved. The result isn't a mechanical lift-off but a chemical destabilisation of the dirt — the bond to the paint is weakened without you having to work the surface mechanically.\u003c\/p\u003e\n\u003cp\u003eOne thing to get right: high-alkaline pre-cleaners aren't \"do-it-all\" cleaners for every situation. They're tuned for organic, alkali-soluble grime. Mineral deposits like lime spots, water spots or embedded metal rust (brake dust as iron particles) barely react to an alkaline attack — that calls for acidic specialist cleaners. The MultiClean Alkaline makes sense in a two-wash concept: alkaline pre-wash first (organic grime), then a follow-up with an iron remover or acidic cleaner (mineral deposits). Combine both steps and you clean chemically all the way, instead of just looking clean.\u003c\/p\u003e\n\u003cp\u003eAlso important: alkaline pre-cleaners have to be rinsed off completely before you go into the shampoo wash — residue can react with some sealants or wax layers and knock back their bond for a while. A thorough pressure rinse after the dwell time is enough to clear the cleaner off fully. On freshly sealed cars (ceramic coating, paint sealant), only use it on genuinely heavily soiled spots and keep it out of the regular weekly wash, so you don't put unnecessary strain on the protection. For the routine wash of a sealed car, reach for a mild, pH-neutral shampoo as your standard wash product instead.\u003c\/p\u003e\n\n\u003ch3\u003eUsing a pre-wash like a pro — the application step by step\u003c\/h3\u003e\n\u003cp\u003eThe best way to use the \u003cstrong\u003eSONAX PROFILINE MultiClean Alkaline\u003c\/strong\u003e starts on a dry car. Moisture on the paint thins the cleaner straight away and cuts the working concentration before it ever had a chance to act. Recommended method: fill the cleaner neat or at a low dilution ratio (1:3 to 1:10 depending on how dirty it is) into a pump sprayer, a \u003ca href=\"\/products\/sonax-profiline-foamsprayer-schaumspruher\"\u003eSONAX PROFILINE FoamSprayer\u003c\/a\u003e or a foam cannon on the pressure washer, and spray it evenly across the whole car — bottom to top, so the cleaner runs down the bodywork and the lower, dirtier areas get properly wetted too.\u003c\/p\u003e\n\u003cp\u003eStick to the dwell time: 2–5 minutes is enough for typical road grime. Don't let it dry on — in direct sun or high temperatures, mist the car lightly in between or shorten the dwell time accordingly. After the dwell, rinse thoroughly with the pressure washer, then move into the normal shampoo wash. Alternatively, the MultiClean Alkaline can be run as a foam cleaner in the foam cannon — foam clings to the surface longer and stretches the effective dwell time with no extra effort. For really stubborn bug splatter on the front end, it pays to work a soft bug sponge or microfibre mitt over it after the pre-wash before you rinse — even that is already a lot gentler than going straight into a contact wash with no chemical pre-wash first.\u003c\/p\u003e\n\n\u003ch3\u003eBug remover for pros — when the alkaline pre-cleaner really shines\u003c\/h3\u003e\n\u003cp\u003eThe MultiClean Alkaline shows its strengths above all in the summer season, when bugs turn into a real cleaning problem. Bug residue is made of proteins, acids (formic acid, acetic acid) and fatty substances — a chemically complex mix that \"bakes\" into the paint the moment it sits for more than a few hours. Those acids in particular can damage paint if bugs aren't removed promptly in hot weather. The high-alkaline formula neutralises those acids and breaks down the protein structures at the same time — which makes the pre-cleaner an effective tool against bugs that cuts the mechanical load during the wash down to a minimum.\u003c\/p\u003e\n\u003cp\u003eA simple rule of thumb applies: the fresher the bug residue, the less dwell time the cleaner needs. Fresh splatter dissolves almost completely within 2–3 minutes of dwell time and then rinses off touchless. With older, dried-on residue — what you see day-to-day on cars left unwashed for several days after a motorway run — a second pass or a quick mechanical follow-up with a soft bug sponge may be needed. That's not a weakness of the cleaner, it's chemical reality: proteins that have been \"baked\" by heat and UV over days need more time or mechanical help to dissolve fully.\u003c\/p\u003e\n\u003cp\u003eBeyond the car body, it's especially worthwhile on motorhomes, vans and commercial vehicles: thanks to their size and mileage, these often carry many times the dirt load of a normal car, and the option of a touchless pre-wash saves a lot of time and effort here. Professional detailing operations run the pre-cleaner as a fixed part of their wash routine — as the first step, before pressure or foam come in. That doesn't just lift cleaning quality, it also stretches the lifespan of the wash pads and mitts, because they meet far less coarse grime.\u003c\/p\u003e\n\n\n\u003ch3\u003ePre-cleaners compared — MultiClean Alkaline vs. MultiStar and MultiClean Acid\u003c\/h3\u003e\n\u003cp\u003eThe SONAX PROFILINE range has three cleaners that look similar at first glance but are built for different jobs. The \u003ca href=\"\/products\/sonax-profiline-multistar-all-purpose-cleaner-universalreiniger\"\u003eSONAX PROFILINE MultiStar All-Purpose-Cleaner\u003c\/a\u003e is the most versatile of the three: a concentrated all-rounder that, depending on dilution, works for interior, wheels, exterior surfaces and more. It's alkaline, but less strong than the MultiClean Alkaline, so it's broader in use and kinder to sensitive surfaces.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eSONAX PROFILINE MultiClean Alkaline\u003c\/strong\u003e, by contrast, is tuned for maximum alkaline cleaning power in the pre-wash — it's not meant for sensitive interior materials, but for tough paint surfaces, sills, wheel arches and front ends. The \u003ca href=\"\/products\/sonax-profiline-multiclean-acid-kraftreiniger-sauer\"\u003eSONAX PROFILINE MultiClean Acid\u003c\/a\u003e is its acidic counterpart: it handles mineral deposits like lime spots, water spots and embedded grime that alkaline cleaners can't shift. In pro work the two are often run as a system: alkaline first (MultiClean Alkaline), then acidic (MultiClean Acid or the \u003ca href=\"\/products\/sonax-profiline-flugrostentferner-kraftreiniger-sauer-eisenentferner\"\u003ePROFILINE FlugrostEntferner\u003c\/a\u003e) — that gives you a complete chemical clean across every type of dirt.\u003c\/p\u003e\n\n\u003ch3\u003eBuy the SONAX PROFILINE MultiClean Alkaline — sizes, concentration, uses\u003c\/h3\u003e\n\u003cp\u003eThe pre-cleaner is available at Detailing1 in two container sizes: 1 litre for hobby detailers and occasional users who want to experience the pro effect without laying in a big stock, plus 5 litres for regular users and detailing operations that keep the product in constant use. Both versions hold the same concentrate formula — the ideal dilution depends on the soiling level and the application method. In pro work with daily use, the 5-litre container clearly pays off, since the price per litre comes out lower and the bigger canister gives you enough volume for larger vehicles and fleets too.\u003c\/p\u003e\n\u003cp\u003eWho gets the most out of this pre-cleaner? Professional detailers running a structured multi-step method (touchless pre-clean + foam wash + hand wash) who put paint safety first. Hobby detailers looking for an effective answer to stubborn traffic film after long runs or in bug season, without having to reach for aggressive chemistry. Owners of dark or sensitive paint, where wash marring shows up the most and the mechanical cleaning load should be kept to a minimum. And anyone who wants to dial in their wash process: pre-wash consistently and you spare the car, the wash gear, and your time in the long run.\u003c\/p\u003e\n\u003cp\u003eAs a practical workflow for your next wash: park the car in the shade, lay the MultiClean Alkaline down with a foam sprayer or foam cannon, let it dwell for 3–4 minutes, rinse thoroughly with pressure. Then apply a \u003ca href=\"\/products\/sonax-profiline-actifoam-energy-reinigungsschaum\"\u003eSONAX PROFILINE ActiFoam Energy\u003c\/a\u003e as a foam wash in the second step and let it dwell, before the hand wash with mitt and pH-neutral shampoo begins. This three-stage approach (alkaline pre-wash → foam → hand wash) is the standard at professional detailing operations and makes a visible difference to surface quality over time on cars in frequent use.\u003c\/p\u003e","brand":"SONAX","offers":[{"title":"5 liters","offer_id":53622519365967,"sku":"D1-SNX-6295000","price":32.49,"currency_code":"EUR","in_stock":false},{"title":"1000 ml \/ 1 liter","offer_id":57340506472783,"sku":"D1-SNX-6293000","price":9.49,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/sonax-profiline-multiclean-alkaline-vorreiniger_5-liter.png?v=1731053233"},{"product_id":"koch-chemie-prewash-express-pe-vorreiniger","title":"PreWash express \"Pe\" Pre-wash","description":"\u003ch2 id=\"speakable-headline\"\u003eCar pre-wash that lifts bugs and road salt touch-free\u003c\/h2\u003e\n\n\u003cblockquote id=\"speakable-summary\"\u003e\n  \u003cp\u003e\u003cem\u003eWhat is the PreWash express \"Pe\" from Koch-Chemie? A high-alkaline pre-wash concentrate for detailers and high-throughput car washes. It breaks down baked-on bugs, bird mess and winter road salt chemically in under a minute, before a wash mitt ever touches the paint. Not for anodised trim, bare aluminium or your weekly maintenance wash.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\n\u003chr\u003e\n\n\u003cp id=\"speakable-definition\"\u003e\u003cstrong\u003ePreWash express \"Pe\"\u003c\/strong\u003e from Koch-Chemie in Unna is a no-compromise high-alkaline \u003cstrong\u003ecar pre-wash\u003c\/strong\u003e — the first stage of a touch-free wash. The high-strength, phosphate-free concentrate pairs modern complexing agents with special surfactants and lifts organic grime like insect protein, road film and grease through saponification and proteolysis. The alkali splits the bonds inside the dirt, it turns water-soluble and rinses off, instead of grinding across your clear coat under the mitt.\u003c\/p\u003e\n\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/d1_koch-chemie-prewash-express-pe-vorreiniger_hero.jpg?v=1780346978\" alt=\"Koch-Chemie PreWash express Pe car pre-wash in front of a dirty AMG nose in the warehouse\" loading=\"eager\" style=\"width:100%;height:auto;border-radius:4px;\"\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\u003cstrong\u003eThe dirt drops before the first mitt comes near.\u003c\/strong\u003e \"Pe\" softens bugs, bird mess and traffic film in a minute flat — far enough that the pressure washer blasts them off. Every grain you flush off touch-free is one that can't drag a scratch through the paint later. That's the whole point of a pre-wash.\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eOne concentrate, three jobs.\u003c\/strong\u003e Depending on how dirty things are, you mix 1:30 to 1:100 for the paint pre-wash, 1:4 to 1:20 for wheels, and 1:2 to 1:15 for wash-bay floors and walls. A 23 kg drum stretches to around 2,300 litres of ready-to-use solution. The complexing agents grab calcium and metal ions in the water, so even hard tap water won't drag the cleaning power down.\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003ePhosphate-free, low-foam, easy on the plant.\u003c\/strong\u003e \"Pe\" is VDA class B — the standard for short contact times in car washes: a minute at most, 1:100 at most. It works with biological grey-water treatment, and the deliberately low foam shortens the rinse. That profile is exactly what express car washes need.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003cblockquote class=\"praxistipp\"\u003e\n  \u003cp\u003e\u003cstrong\u003eDay-to-day from Detailing1:\u003c\/strong\u003e The most expensive mistake with a high-alkaline pre-wash is laying it down in the sun or on warm paint. The water flashes off in seconds, the concentrate burns into the clear coat as a milky haze — and the only way back out is the polishing machine. Work in the shade, on a surface that's cool to the hand, and run two short passes rather than one long dwell. What we see day-to-day: etch one black bumper like that and you never forget the rule again.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eMix cool, dwell short, rinse hard\u003c\/h3\u003e\n\u003cp\u003eAlways lay the \u003cstrong\u003ecar pre-wash\u003c\/strong\u003e down diluted, on cool bodywork that hasn't heated up — work bottom to top and rinse it off completely with the pressure washer after a minute at most. That keeps the reaction in the safe zone.\u003c\/p\u003e\n\u003cp\u003eWhy pre-wash at all? The coarse grit you pick up on the road — silica dust, bug shells, salt crystals — acts like sandpaper the moment you start washing. A car pre-wash takes those particles apart through proteolysis and saponification: protein and grease lose their grip, the pressure washer carries them off before a sponge or brush ever touches the surface.\u003c\/p\u003e\n\u003cp\u003eHow strong you mix depends on the kit. In a pump sprayer — an IK pressure sprayer, say — the mix you make up hits the paint neat, so you deliberately go thinner here and meter it precisely.\u003c\/p\u003e\n\u003cp\u003eWith a foam lance it's the other way round: the pressure washer's water stream dilutes the bottle mix hard a second time, about tenfold. If you want a clean 1:100 on the paint through the lance, you mix the bottle at around 1:10 to start with. All that counts is what actually lands on the paint — plenty of people get that sum wrong and lay it down far too strong by accident.\u003c\/p\u003e\n\u003cp\u003eThe three dilution windows aren't arbitrary, they're working ranges: 1:30 to 1:100 for the paint pre-wash on a car, 1:4 to 1:20 for loose wheel grime and brake dust on alkali-resistant wheels, 1:2 to 1:15 for algae, oil film and biofilm on bay floors. The more delicate the surface, the thinner the mix and the closer your eye on the clock.\u003c\/p\u003e\n\u003cp\u003eBottom to top stops run-off concentrate streaking on dry panels. With heavy build-up — crusted bugs after a motorway run, a thick layer of salt in February — a second short pass beats leaving it to sit. Letting it dry is off the table: a dried alkaline film is exactly what leaves the marks afterwards.\u003c\/p\u003e\n\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/d1_koch-chemie-prewash-express-pe-vorreiniger_anwendung.jpg?v=1780346985\" alt=\"Car pre-wash being sprayed onto the dirty front end with a pro pressure sprayer\" loading=\"lazy\" style=\"width:100%;height:auto;border-radius:4px;\"\u003e\u003c\/p\u003e\n\n\u003ch3\u003eAnodised and bare aluminium stay off-limits\u003c\/h3\u003e\n\u003cp\u003e\"Pe\" is cleared for intact clear coat, steel wheels and alkali-resistant painted alloy wheels — not for anodised aluminium, bare metal or mirror-polished rims. That line isn't red tape, it's chemistry.\u003c\/p\u003e\n\u003cp\u003eAnodising is the satin, electrochemically sealed protective layer on a lot of trim strips, window frames and roof rails on premium cars. Aluminium is amphoteric — it dissolves in strong alkalis just as it does in acids. Let \"Pe\" hit a strip like that too strong or too long and the alkali eats into the layer, leaving milky-white, iridescent marks. They won't polish out; the strip has to be replaced. On bare or polished alloy the metal reacts on contact and dulls right off.\u003c\/p\u003e\n\u003cp\u003eOn intact clear coat, though, \"Pe\" is safe as long as you hold the minute. Modern clear coats are highly cross-linked polymers that shrug off a short alkaline spike with no trouble; dilute to 1:100 and the working pH on the paint drops into the 11 to 12 region anyway. Steel wheels and powder-coated, alkali-resistant alloy wheels take the stronger wheel dose — all that matters is the wheel isn't bare, anodised or mirror-polished.\u003c\/p\u003e\n\u003cp\u003eThe second hard line is heat. On a sun-warm bonnet the water in the solution flashes off in seconds, the alkali concentrates back up in spots and etches the clear coat. What's left is baked-in tide marks that only a machine polish removes. So the rule stands: never in full sun, never on hot metal.\u003c\/p\u003e\n\u003cp\u003eAnd \"Pe\" doesn't tell the difference between dirt and a protective layer. A product around pH 13 is as caustic as a drain cleaner and strips waxes, sealants and weaker coatings clean off. That's exactly why it's not a maintenance product. If you want to wash your waxed or ceramic-coated car gently, stick to the pH-neutral \u003ca href=\"\/collections\/autoshampoo\"\u003ecar shampoo\u003c\/a\u003e; \"Pe\" would take the protection off along with the dirt.\u003c\/p\u003e\n\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/d1_koch-chemie-prewash-express-pe-vorreiniger_ergebnis.jpg?v=1780346992\" alt=\"Clean rinsed front end after the pre-wash, Pe pre-wash standing next to it\" loading=\"lazy\" style=\"width:100%;height:auto;border-radius:4px;\"\u003e\u003c\/p\u003e\n\n\u003ch3\u003eBuilt for high-throughput washing, not the weekend\u003c\/h3\u003e\n\u003cp\u003e\"Pe\" earns its keep where speed matters: in express car washes, on fleets, commercial vehicles and badly soiled cars — not on a relaxed weekend wash in the driveway.\u003c\/p\u003e\n\u003cp\u003eIn the wash tunnel that short, no-compromise action is an upside: the plant meters precisely, cycles fast and rinses through quickly thanks to the low foam. For the detailer working by hand, that's the catch. The VDA minute is gone fast once you've walked a big SUV with the pump sprayer — by the time you're back, the concentrate at your starting point has been sitting far too long. So you work \"Pe\" in sections: spray one side, rinse, then the next.\u003c\/p\u003e\n\u003cp\u003eDetailers reach for \"Pe\" as a dirt-breaker on purpose, not as an all-rounder: for neglected used cars, winter salt crust, engine bays, or to strip wax before a polish and re-seal. Within the Koch-Chemie line-up it's the top energy stage. If you want the classic, higher-foaming pre-wash for longer dwell times, the sister product \u003ca href=\"\/products\/koch-chemie-vorreiniger-b-vb-vorreiniger\"\u003eVorreiniger B\u003c\/a\u003e is the better fit; \"Pe\" is the low-foam, express-tuned option in the \u003ca href=\"\/collections\/vorreiniger\"\u003ePre-wash\u003c\/a\u003e range.\u003c\/p\u003e\n\u003cp\u003eThe numbers stack up mostly in volume work. A 23 kg drum makes around 2,300 litres of finished pre-wash solution at 1:100 — enough for hundreds of cars. Spread across a single wash the product cost barely shows; the real lever is the time the short dwell phase saves per car. For a handful of cars a month the 5 kg pack lasts a long while instead, with no concentrate ageing unused.\u003c\/p\u003e\n\u003cp\u003eThe pack sizes follow that logic: 5 kg to get started and for smaller operations, 23 kg as the standard drum for a running plant, 225 kg in the barrel for high-frequency wash tunnels with automatic dosing. The one thing no label spells out: the maximum dwell time isn't a suggestion, it's the safety limit. \"Pe\" is built for the machine that's done in 60 seconds. Respect that by hand and work in sections, and you get the full dirt-cutting power without ever risking a trim strip.\u003c\/p\u003e\n\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/d1_koch-chemie-prewash-express-pe-vorreiniger_lineup.jpg?v=1780346999\" alt=\"Koch-Chemie PreWash express Pe packs, 5 kg and 23 kg side by side\" loading=\"lazy\" style=\"width:100%;height:auto;border-radius:4px;\"\u003e\u003c\/p\u003e","brand":"Koch-Chemie","offers":[{"title":"5kg","offer_id":57637056315727,"sku":"D1-KCX-296005","price":23.99,"currency_code":"EUR","in_stock":true},{"title":"23 kg","offer_id":57637109694799,"sku":"D1-KCX-296023","price":92.49,"currency_code":"EUR","in_stock":true},{"title":"225kg","offer_id":57637109727567,"sku":"D1-KCX-296225","price":972.99,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/koch-chemie-prewash-express-pe-vorreiniger_c84633b8-b584-42a7-a8d8-5f3a21695246.png?v=1780347129"}],"url":"https:\/\/detailing1.co.uk\/collections\/alkalische-vorreiniger.oembed","provider":"Detailing1","version":"1.0","type":"link"}