{"product_id":"koch-chemie-glas-star-gla-glasreiniger-konzentrat","title":"Glas Star \"Gla\" Glass Cleaner Concentrate","description":"\u003ch2 id=\"speakable-headline\"\u003eStreak-free glass with Koch-Chemie Glas Star\u003c\/h2\u003e\n\n\u003cblockquote id=\"speakable-summary\"\u003e\n  \u003cp\u003e\u003cem\u003eWhat is Koch-Chemie Glas Star? An alcohol-based glass cleaner concentrate that pulls oil, grease, silicone, wax residue, and squashed bugs off windows, mirrors, and smooth surfaces without streaks. Keep it off matte paint, bare wood, and the edges of aftermarket tint film.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\n\u003chr\u003e\n\n\u003cp id=\"speakable-definition\"\u003e\u003cstrong\u003eGlass cleaner concentrate\u003c\/strong\u003e in its purest form goes by \"Glas Star\" at Koch-Chemie — an alcohol-based pro cleaner from Unna that you use neat or cut up to 1:3 with distilled water. One liter of concentrate makes up to four liters of ready-to-use spray. The formula carries a Daimler approval and has been a workshop standard and mobile-detailer go-to for years.\u003c\/p\u003e\n\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/d1_koch-chemie-glas-star-gla-glasreiniger-konzentrat_hero.png?v=1776204771\" alt=\"Koch-Chemie Glas Star Glass Cleaner Concentrate 1L bottle and Pro Glass Towel on paving stones in front of a black Audi RS3\" loading=\"lazy\"\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUnder 5 cents per application.\u003c\/strong\u003e At 1:3 dilution, 1,000 ml of concentrate makes about four liters of spray — roughly 130 vehicle-window applications at 30 ml per spray. The 1,000 ml bottle works out to less than a euro per full interior glass clean.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAlcohol base dries down in winter.\u003c\/strong\u003e Water-based cleaners freeze in the bottle at -5 °C and pull streaks across the panel. Glas Star flashes off residue-free at low temperatures — at -10 °C you are still streak-free in under 30 seconds.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShine and glide without silicone-oil residue.\u003c\/strong\u003e The concentrate carries glide aids that let the microfibre run easily across the glass. Unlike silicone-oil \"shine formulas,\" they don't leave a film that smears the next time you clean.\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 bay:\u003c\/strong\u003e Cut Glas Star only with distilled or osmosis water, never tap water — the lime in tap water leaves white drying marks the alcohol can't override, and you'll spot them in tomorrow's sunlight. Our day-to-day mix sits at 60% concentrate to 40% distilled water for medium soiling. The official 1:3 is for clean refresh passes, not for the heavy stuff.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eNeat or diluted: dial in the mix\u003c\/h3\u003e\n\u003cp\u003eYou mix Glas Star into a \u003ca href=\"\/en\/products\/koch-chemie-spruehkopf-spruehflasche-set\"\u003espray bottle with a Canyon CHS-3AN spray head\u003c\/a\u003e — the concentrate bottle itself ships without a spray head because it's a refill format. For standard interior work, 250 ml of concentrate into 750 ml of distilled water gives you a liter of spray. That 1:3 ratio is Koch-Chemie's official spec and handles light to medium soiling without drama.\u003c\/p\u003e\n\n\u003cp\u003eOn heavily-soiled glass — nicotine film, baked-on bugs on the inside of the windshield, old adhesive or sticker residue — you go neat. Spray straight onto the glass towel, not the panel, so you don't fling drops onto the dashboard or door card. Neat is also the move for the inside of the windshield, where outgassed plastics build a paper-thin film that diluted mix only half-dissolves. You spot that layer by the streaky glare in backlight even after you've just cleaned.\u003c\/p\u003e\n\n\u003cp\u003eDilution mistake we see often: concentrate first into the empty bottle, then water — that order builds a foam crown you'll be rinsing for minutes. Reverse it: water first, then drop the concentrate in and swirl slowly, don't shake. Holds for any alcohol-based \u003cstrong\u003eglass cleaner concentrate\u003c\/strong\u003e, not just Glas Star.\u003c\/p\u003e\n\n\u003cp\u003ePre-mixed spray lasts several months as long as you keep it frost-free and out of direct light. Sun in a clear spray bottle eats the shine additives noticeably after about eight weeks. An HDPE bottle from the spray-bottle set holds up far better than any recycled clear bottle out of the drugstore aisle.\u003c\/p\u003e\n\n\u003cp\u003eLabel every bottle with the ratio and the date. Sounds petty, saves frustration: if three months down the line the result gets worse, you know straight away whether it's the towel, the ratio, or an aged mix. A clear label or a permanent marker straight on the HDPE works — the writing survives the odd splash of concentrate.\u003c\/p\u003e\n\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/d1_koch-chemie-glas-star-gla-glasreiniger-konzentrat_anwendung.png?v=1776204778\" alt=\"Spray mist from the Glas Star bottle hits a Pro Glass Towel in a black-nitrile-gloved hand on a black Audi RS3\" loading=\"lazy\"\u003e\n\n\u003ch3\u003eAlcohol cuts films. Not tint film.\u003c\/h3\u003e\n\u003cp\u003eThe alcohol content pulls silicone, grease, wax residue, and light overspray in one wipe — the bread-and-butter of most interior glass work. It also cuts baked-on bugs on the outside of the windshield if you pre-soak with water first. So Glas Star handles both inside and outside glass — most interior-only cleaners can't say the same.\u003c\/p\u003e\n\n\u003cp\u003eOn the inside of the rear screen, most cleaners struggle because the embedded heating elements act like edges. Glas Star runs smoothly over the wires thanks to the glide aid and won't streak there — as long as you wipe in one direction with a \u003ca href=\"\/en\/products\/koch-chemie-pro-glass-towel-230gsm-mikrofaser-glastuch\"\u003eglass-specific microfibre\u003c\/a\u003e, not in circles. A normal all-purpose microfibre with a high GSM (over 400) doesn't push the liquid across, it soaks it up — and leaves you the streaks you were trying to avoid.\u003c\/p\u003e\n\n\u003cp\u003eWhere Glas Star isn't the right call: along the adhesive edges of aftermarket tint film, the high alcohol content can lift the glue over weeks. Cut to at least 1:3 and keep clear of the edges. On anti-fog coated interior glass (some OEM windshields from 2020 onward), neat Glas Star can streak — patch-test on a 5×5 cm spot first. For matte surfaces, bare wood, or acrylic (convertible rear windows) it's out — for those the much milder \u003ca href=\"\/en\/products\/tuga-chemie-tugalin-glas-teufel-glasreiniger\"\u003eTugalin Glas-Teufel\u003c\/a\u003e sits in the range as a ready-to-use option.\u003c\/p\u003e\n\n\u003cp\u003eThe Daimler approval on the concentrate means this: the product has been signed off in the manufacturer's materials lab for use on the glass and plastic trims fitted to all current Mercedes models. Other manufacturer approvals aren't officially documented, but the material composition of German and European vehicle glass barely varies — so the Daimler tick is a reliable proxy for broader compatibility.\u003c\/p\u003e\n\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/d1_koch-chemie-glas-star-gla-glasreiniger-konzentrat_ergebnis.png?v=1776204786\" alt=\"Streak-free Audi RS3 windshield after a clean with Koch-Chemie Glas Star, glass towel resting on the wiper\" loading=\"lazy\"\u003e\n\n\u003ch3\u003eConcentrate for the shop. Spray bottle for the car.\u003c\/h3\u003e\n\u003cp\u003eIf you maintain more than two vehicles, the \u003cstrong\u003eglass cleaner concentrate\u003c\/strong\u003e beats any pre-mixed spray solution: 10 liters make 40 liters of spray, which at 30 ml per car works out to around 1,300 full cleans. Mobile detailers and shops almost always grab the 10 or 20-liter variant. Versus ready-to-use 750 ml spray bottles, you save around 80% in packaging and 60% in cost for the same number of applications.\u003c\/p\u003e\n\n\u003cp\u003eFor private use, the 1-liter bottle usually rides three to five years. Mix once, store the spray bottle frost-free in the garage, and your interior cleans for the next season are queued up. The variant with the spray-head set is the easy-entry option — concentrate plus a matching HDPE spray bottle with a Canyon spray head in one order, no separate sourcing needed.\u003c\/p\u003e\n\n\u003cp\u003eIn the Detailing1 workflow, Glas Star follows the \u003ca href=\"\/en\/collections\/glasreiniger\"\u003ewheel and paint cleaning block\u003c\/a\u003e, otherwise the overspray from other cleaners lands back on the freshly cleaned glass. Inside, the windshield gets done last — after cockpit and dash have been dusted with microfibre — otherwise loose particles ride the air current and you're starting over. Get the order right once, half the time on the next car.\u003c\/p\u003e\n\n\u003cp\u003eThe most important insider tip for any \u003cstrong\u003eglass cleaner concentrate\u003c\/strong\u003e hits the inside of the windshield: kill the fan or run on recirculation. With fresh air on, the blower pulls dust out of the engine bay onto the glass while you're wiping — streaks are basically guaranteed.\u003c\/p\u003e\n\n\u003cp\u003ePros also flip the sun visors down, because an astonishing amount of spray ends up on them. When you're done and drive off, it runs back onto the freshly cleaned screen as drops. Neither trick lives in any data sheet, but they're the difference between \"okay clean\" and \"looks like a fresh hand-over.\"\u003c\/p\u003e\n\n\u003cp\u003eIf you work with the concentrate regularly, after a few months you build your own system: one dedicated spray bottle at one fixed ratio, a glass-only towel that never touches cockpit or paint, and a second towel for the dry-off. That separation stops silicone-oil residue from cockpit care creeping over the towel onto the next window, where it leaves the half-moon streaks that even a second clean barely takes off.\u003c\/p\u003e\n\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/d1_koch-chemie-glas-star-gla-glasreiniger-konzentrat_lineup.png?v=1776205730\" alt=\"Koch-Chemie Glas Star Glass Cleaner Concentrate lineup — 1L, 10L, and 1L with Canyon spray head\" loading=\"lazy\"\u003e","brand":"Koch-Chemie","offers":[{"title":"1000 ml \/ 1 liter","offer_id":48463561163087,"sku":"D1-KCX-44001","price":7.55,"currency_code":"EUR","in_stock":true},{"title":"1000ml + Canyon spray head CHS-3AN","offer_id":49154922414415,"sku":"D1-KCX-39104+CHS-3AN","price":12.63,"currency_code":"EUR","in_stock":true},{"title":"1000ml + Canyon Spray Head CHS-3AN + HDPE Cylinder Bottle","offer_id":49154922447183,"sku":"D1-KCX-39104+CHS-3AN+HDPE","price":16.69,"currency_code":"EUR","in_stock":true},{"title":"10 liters","offer_id":48463564079439,"sku":"D1-KCX-44010","price":53.89,"currency_code":"EUR","in_stock":true},{"title":"20 liters","offer_id":49602860613967,"sku":"D1-KCX-44020","price":99.28,"currency_code":"EUR","in_stock":true},{"title":"200 liters","offer_id":49602860646735,"sku":"D1-KCX-44200","price":929.55,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/koch-chemie-glas-star-premium-glasreinigerkonzentrat.jpg?v=1710623027","url":"https:\/\/detailing1.nl\/en\/products\/koch-chemie-glas-star-gla-glasreiniger-konzentrat","provider":"Detailing1","version":"1.0","type":"link"}