{"product_id":"koch-chemie-glas-star-gla-glasreiniger-konzentrat","title":"Glas Star \"Gla\" Glass Cleaner Concentrate","description":"\u003ch2 id=\"speakable-headline\"\u003eStreak-free cleaning 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? A concentrated, alcohol-based glass cleaner that removes oil, grease, silicone, wax residues, and insect remains from windows, mirrors, and smooth surfaces without leaving streaks. Not suitable for matte finishes, wood, or untreated tint film edges.\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 is called \"Glas Star\" at Koch-Chemie — an alcohol-based professional glass cleaner from Unna, used neat or diluted up to 1:3 with distilled water. One liter of concentrate yields up to 4 liters of ready-to-use spray solution. The formulation has Daimler approval and has been standard in workshops and mobile detailing setups 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 spray 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\u003eCost per application under 5 cents.\u003c\/strong\u003e With a 1:3 dilution, 1,000 ml of concentrate yield about 4 liters of spray solution. This is enough for approximately 130 vehicle window applications, each with 30 ml of spray volume. Even the 1,000 ml bottle thus costs less than one euro per complete interior cleaning.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAlcohol-based also dries in winter.\u003c\/strong\u003e Water-based glass cleaners freeze in the spray bottle at -5 °C and leave streaks on the window. Glas Star evaporates residue-free even at low temperatures — at -10 °C, the wiping process still takes less than 30 seconds to be streak-free.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShine and glide additives without silicone oil residues.\u003c\/strong\u003e The concentrate contains glide aids that allow the microfiber cloth to slide easily over the window. Unlike silicone oil-containing \"shine formulas,\" they leave no film that turns into smears during the next cleaning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003cblockquote class=\"praxistipp\"\u003e\n  \u003cp\u003e\u003cstrong\u003ePractical tip from Detailing1:\u003c\/strong\u003e Dilute Glas Star exclusively with distilled water or osmosis water, never with tap water — the lime in the water would otherwise leave white drying marks despite the alcohol, which you'll see in the sun the next day. The practical mixture in our workshop is 60% concentrate to 40% distilled water for medium soiling. Only the official 1:3 is intended for pure re-cleaning.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eNeat or diluted: the right mixture\u003c\/h3\u003e\n\u003cp\u003eGlas Star is mixed in 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 does not have a spray head, as it is intended for storage. For standard interior applications, mix 250 ml of concentrate with 750 ml of distilled water to make one liter of spray solution. This 1:3 mixture is the official manufacturer's specification and is sufficient for light to medium soiling.\u003c\/p\u003e\n\n\u003cp\u003eFor heavily soiled windows — nicotine films, baked-on insect residues on the inside of the windshield, old adhesive or sticker residues — use it neat. Spray directly onto the glass towel, not onto the window, to avoid drips on the dashboard or door panel. Neat is also the choice for the inside of the windshield, where outgassing from plastics forms a thin plastic film that diluted solutions only partially dissolve. You'll recognize this layer by the streaking effect in backlight despite a freshly cleaned window.\u003c\/p\u003e\n\n\u003cp\u003eCommon dilution error: concentrate first into the empty spray bottle, then water on top — this order leads to a foam crown that you'll be rinsing out for minutes. The other way is faster: first the water, then add the concentrate and swirl the bottle slowly, do not shake. This applies to any alcohol-based glass cleaner concentrate, not just Glas Star.\u003c\/p\u003e\n\n\u003cp\u003eThe ready-mixed spray solution has a shelf life of several months, as long as you store it frost-free and in the dark. Direct sun in a transparent spray bottle noticeably reduces the effect of the shine additives after about eight weeks. An HDPE bottle from the spray bottle set is therefore a more durable solution than any recycled clear bottle from the drugstore.\u003c\/p\u003e\n\n\u003cp\u003eAlways label the spray bottle with the mixing ratio and date. It may sound petty, but it saves frustration: if three months later the result suddenly gets worse, you'll immediately know whether it's due to the cloth, the mixing ratio, or an overaged solution. Clear labels or a permanent marker directly on the HDPE bottle are sufficient — the label will also survive accidental splashes with the alcohol-based concentrate itself.\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 spray bottle hits a Pro Glass Towel in a hand with a black nitrile glove on an Audi RS3\" loading=\"lazy\"\u003e\n\n\u003ch3\u003eAlcohol dissolves films. Not tint films.\u003c\/h3\u003e\n\u003cp\u003eThe alcohol content reliably dissolves silicone, grease, wax residues, and light paint mist in one wipe — the main problem area for most interior windows. It also dissolves baked-on insects on the outside of the windshield if pre-soaked with water. This means Glas Star covers both interior and exterior cleaning, which is usually not the case with pure interior glass cleaners.\u003c\/p\u003e\n\n\u003cp\u003eOn the inside of the rear window, most glass cleaners perform worse because the embedded heating wires act as edges. Glas Star, thanks to the glide aid, moves smoothly over the wires and leaves no streaks there — provided you wipe in one direction with a \u003ca href=\"\/en\/products\/koch-chemie-pro-glass-towel-230gsm-mikrofaser-glastuch\"\u003eglass-specific microfiber cloth\u003c\/a\u003e, not in circles. A normal all-purpose microfiber cloth with a high GSM (over 400) does not push away the cleaning liquid, but absorbs it, leaving precisely the streaks you want to avoid.\u003c\/p\u003e\n\n\u003cp\u003eWhere Glas Star is not the right product: On the adhesive edges of retrofitted tint films, the high alcohol content can dissolve the adhesive over weeks. Here, dilute at least 1:3 and keep a distance from the edges. On anti-fog coated interior windows (some OEM windshields from 2020), neat Glas Star leaves streaks — test on a 5x5 cm area beforehand. It is unsuitable for matte surfaces, untreated wood, or acrylic glass (convertible rear windows); for these, the significantly milder \u003ca href=\"\/en\/products\/tuga-chemie-tugalin-glas-teufel-glasreiniger\"\u003eTugalin Glas-Teufel\u003c\/a\u003e is available as a ready-to-use alternative.\u003c\/p\u003e\n\n\u003cp\u003eThe Daimler approval of the concentrate specifically means: The product has been approved in the manufacturer's material testing laboratory for use on the installed window materials and plastic frames of all current Mercedes models. Other manufacturer approvals are not official, but the material composition of German and European vehicle windows hardly differs — so the approval is a reliable indicator of general 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 cleaning with Koch-Chemie Glas Star glass cloth on windshield wiper\" loading=\"lazy\"\u003e\n\n\u003ch3\u003eConcentrate for the workshop. Spray bottle for the car.\u003c\/h3\u003e\n\u003cp\u003eAnyone who maintains more than two vehicles is better off with glass cleaner concentrate than with any spray bottle solution: 10 liters yield 40 liters of spray solution, which, at a consumption of 30 ml per vehicle, corresponds to about 1,300 complete cleanings. Mobile detailers and workshops therefore almost exclusively opt for the 10 or 20-liter variant. Compared to ready-to-use 750 ml spray bottles, you save about 80% of packaging and 60% of costs for the same number of applications.\u003c\/p\u003e\n\n\u003cp\u003eFor private use, the 1-liter bottle usually lasts three to five years. If you mix once and then store the spray bottle frost-free in the garage, your interior cleanings for the next season are prepared. The variant with a spray head set is the beginner-friendly solution — concentrate plus a suitable HDPE spray bottle with a Canyon spray head in one order. This eliminates the hassle of separate procurement.\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 spray mist of other cleaners will re-soil fresh windows. Inside, the windshield is cleaned last, after the cockpit and dashboard have been dusted with microfiber — otherwise dust particles will land on the still-wet window via the air current and you'll have to start over. Anyone who follows this sequence once will need half the time next time.\u003c\/p\u003e\n\n\u003cp\u003eThe most important insider tip for glass cleaner concentrate concerns the inside of the windshield: Keep the ventilation control on \"off\" or \"recirculation.\" If fresh air is on, the fan draws dust from the engine compartment area to the window while you wipe — streaks are then inevitable.\u003c\/p\u003e\n\n\u003cp\u003eProfessional detailers also fold down the sun visors, because an astonishing amount of liquid collects there during spraying. When you're done and drive off, it runs down onto the freshly cleaned window as drops. Neither trick is in any data sheet, but they make the difference between \"okay clean\" and \"delivered as from the workshop.\"\u003c\/p\u003e\n\n\u003cp\u003eAnyone who regularly works with glass cleaner concentrate will develop their own system after a few months: a fixed spray bottle with a fixed mixture, a dedicated glass towel exclusively for windows (never for the cockpit or paint), and a second towel for drying. This separation prevents silicone oil residues from cockpit care products from transferring to the next window via the towel, leaving behind the notorious crescent-shaped streaks that are almost impossible to remove even with a second cleaning.\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 all sizes 1L 10L and 1L with Canyon spray head Lineup\" loading=\"lazy\"\u003e","brand":"Koch-Chemie","offers":[{"title":"1000ml","offer_id":48463561163087,"sku":"D1-KCX-39104","price":6.13,"currency_code":"EUR","in_stock":true},{"title":"10 liters","offer_id":48463564079439,"sku":"D1-KCX-68134","price":50.02,"currency_code":"EUR","in_stock":true},{"title":"20 liters","offer_id":49602860613967,"sku":"D1-KCX-44020","price":93.44,"currency_code":"EUR","in_stock":true},{"title":"200 liters","offer_id":49602860646735,"sku":"D1-KCX-44200","price":883.44,"currency_code":"EUR","in_stock":true},{"title":"1000ml + Canyon spray head CHS-3AN","offer_id":49154922414415,"sku":"D1-KCX-39104+CHS-3AN","price":10.05,"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":13.97,"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.lu\/en\/products\/koch-chemie-glas-star-gla-glasreiniger-konzentrat","provider":"Detailing1","version":"1.0","type":"link"}