Wipers & Glass — XTREME by SONAX

Crystal Clear Windows as a System – SONAX XTREME Window Care

What does SONAX XTREME Window Care include? Four coordinated products for glass cleaning, washer fluid, and window sealing – from quick interim cleaning to ceramic long-term protection, each developed for interior and exterior windows.

SONAX XTREME Window Care is not a haphazard assortment, but a well-thought-out system for all glass surfaces on a vehicle. With the XTREME series, SONAX has developed four complementary products: from glass cleaner for quick interim cleaning, two washer fluid variants for the windshield washer fluid reservoir, to ceramic glass sealant that combines cleaning and long-term protection in one step. The idea behind it: every window situation – be it insect residue in summer, salt haze in winter, or a greasy film on the inside window – requires the right chemical, not just more pressure on the cloth. Those who care for windows like paintwork – i.e., systematically instead of by chance – will be better off with the XTREME series in the long run.

• Four products, one workflow. XTREME ScheibenKlar for manual cleaning, ScheibenReiniger Summer as ready-to-use washer fluid, ScheibenReiniger 1:100 as an economical concentrate, and Ceramic ScheibenKlar 2 in 1 as a cleaner with integrated ceramic sealant. Together, they cover every requirement – from the everyday driver to the detailing professional. No product is superfluous, and none makes another redundant.
• Streak-free results without re-polishing. The Pure-Water-Technology in the ScheibenKlar formula is based on demineralized water, which wets more evenly and dries without residue. No limescale, no streaks – not even on interior windows, where conventional cleaners often fail. The difference is particularly noticeable against glare: where other cleaners leave a milky haze, the window remains optically invisible.
• Protection beyond cleaning. Special anti-resoiling components slow down re-soiling, and the Ceramic 2in1 technology builds up a hydrophobic protective layer with each application. This significantly extends the intervals between cleanings – a real time-saver, especially for frequent drivers.

Practical tip from Detailing1: The most common mistake in window cleaning is using the wrong cloth. Paper towels leave fibers, old cotton rags scratch and only smear the dirt. Use a SONAX PROFILINE Microfiber Cloth "Glass" – its short fibers absorb dirt and moisture without leaving residues. Spray the cleaner directly onto the window (not onto the cloth), spread with the wet side, and wipe with the dry side. One pass is enough. For the inside of the windshield, it is recommended to work with the door open – this way you can also reach the corners of the dashboard cleanly.

Pure-Water-Technology and Ceramic 2in1 – the technologies behind the XTREME series

Two technologies form the backbone of the SONAX XTREME Window & Glass range. The first is Pure-Water-Technology, used in XTREME ScheibenKlar: Instead of ordinary tap water, SONAX uses demineralized water as the basis of the cleaning formula. The difference may seem small at first glance, but it has a measurable effect – minerals like limescale and magnesium, which leave visible residues on the glass when drying, are completely absent. The cleaning formula wets the surface more evenly, dissolves grease films, nicotine deposits, and fingerprints more efficiently, and dries streak-free. The result is a window that you don't have to re-polish or wipe multiple times – one pass is enough to see no streaks, even in critical glare.

The advantage is particularly evident on interior windows: over weeks, a greasy film accumulates there from plastic outgassing from the dashboard, skin oils, and fine dust. Conventional tap water-based glass cleaners loosen this film, but redistribute it during drying – with limescale residues as a bonus. Pure-Water-Technology bypasses this problem because drying residues are simply eliminated. The glass not only becomes clean but truly clear. Drivers who frequently drive at dusk or at night immediately notice the difference: without a greasy film, there are no annoying light refractions from oncoming traffic, and the window "disappears" optically – you look through it, rather than at it.

The second key technology is found in XTREME Ceramic ScheibenKlar 2 in 1: Here, SONAX combines a glass cleaner with silicon nanoparticles that polymerize on the glass surface during cleaning. While the cleaner dissolves dirt, the ceramic components simultaneously embed themselves in the uppermost microstructure of the glass surface. This creates a hydrophobic protective layer on which water droplets visibly bead off. This is not only visually impressive – the layer also reduces re-soiling because dust, pollen, and insect residues adhere less effectively. Unlike classic ceramic sealants, which require a multi-stage application with preparation cloths and curing times, Ceramic 2in1 technology works in a single step: spray on, rub in, let dry for five minutes – done.

The two washer fluid variants – ScheibenReiniger Summer and ScheibenReiniger 1:100 Concentrate – rely on a different strength: they combine cleaning power with glide protection for the windshield wipers and integrated corrosion protection for the washer nozzles and lines. The Summer cleaner comes ready-to-use and is optimized for insect residues, pollen, and road dust. The concentrate offers maximum flexibility and economy: 10 ml per 1 liter of water yields ready-to-use washer fluid – from a 250-ml bottle, you get up to 25 liters. In summer, with heavy insect contamination, you can increase the concentration to 1:80; in winter, the alcohol and glycol content provides frost protection down to sub-zero temperatures.

What all four products have in common is material compatibility: SONAX has designed the XTREME formulas to be pH-neutral (between 6.5 and 7.5). This means they do not attack rubber seals, plastic surrounds, or special coatings on the glass. Vehicles with heat protection films, privacy glass, or tinted windows can also be treated without hesitation. This is not a self-evident standard – some aggressive glass cleaners can attack films and coatings over time if they contain alkaline ingredients.

Which XTREME Window Product for Which Use – Range Navigator

The four products in the XTREME series for windows and glass have clearly defined areas of application, and the choice depends on what you want to achieve and how often you care for your vehicle.

The XTREME ScheibenKlar is your all-rounder for manual cleaning: grab the spray bottle, spray the window, wipe with a microfiber cloth – done. It works inside and out and is also suitable for mirrors, headlight glass, and even household windows. Choose this product if you want quickly clean windows without building up a sealing effect. It is also the first choice for interior windows because it does not leave a hydrophobic layer that could promote fogging there. The 500-ml bottle is sufficient for dozens of applications – one spray per quadrant is enough. ScheibenKlar also works for navigation displays and infotainment screens, provided you do not spray it directly onto the screen but onto the cloth – this prevents liquid from running into gaps and ventilation openings.

The XTREME ScheibenReiniger Summer comes ready-to-use and goes directly into your vehicle's washer fluid reservoir. It is optimized for the challenges of the warmer months – insect residues, pollen, tree sap, and road dust – and ensures that your wipers glide cleanly across the windshield instead of just smearing dirt. The integrated glide protection also protects the wiper blades. The 3-liter bottle lasts for several weeks, depending on driving performance. Ideal for anyone who wants a functional washer fluid without mixing and wants to keep window care uncomplicated.

The XTREME ScheibenReiniger 1:100 Concentrate is the economical alternative for frequent drivers and commercial users. 250 ml of concentrate yields up to 25 liters of washer fluid – which is significantly cheaper per liter than any ready-to-use product. The concentration can be adjusted to the season: standard 1:100 for spring and autumn, 1:80 for summer with heavy insect contamination, in winter the higher concentrated mixing ratio provides frost protection. Anyone who maintains many vehicles or manages a fleet cannot do without this concentrate.

And for those who want to go a step further: The XTREME Ceramic ScheibenKlar 2 in 1 cleans and seals in one step. After application and five minutes of drying time, the ceramic layer creates a lotus effect – raindrops bead off and carry away dirt particles. This significantly reduces cleaning effort between maintenance intervals. The premium option for anyone who wants their windows not only clean but also actively protected. Important: Only apply it to dry exterior windows. For interior windows, the regular ScheibenKlar remains the better choice, as a hydrophobic layer inside the car can promote fogging.

Window Care in Workflow – How to Use the XTREME Series Correctly

The most effective workflow with the XTREME window series follows a clear three-step process: basic cleaning, fine cleaning, optional sealing. First, fill one of the washer fluids into your vehicle's windshield washer reservoir – the ScheibenReiniger Summer in the warmer months, the 1:100 concentrate year-round. While driving or during a hand wash, the washer fluid dissolves coarse dirt: insect residues, road dust, salt residues. The windshield wipers distribute the solution and remove the softened dirt. It is important to allow the washer fluid two to three seconds to dwell before the wipers run – this way, the formula breaks down the dirt instead of just moving it around.

After washing or as an interim cleaning, reach for the XTREME ScheibenKlar: spray thinly onto the window, spread with the PROFILINE Microfiber Cloth "Glass", wipe with the dry side. Work in strokes from top to bottom – not in circles, as circular movements only redistribute the dirt. For the inside of the windshield, use the same cleaner, but work with the door open – this way you can also reach the hard-to-reach corners of the dashboard. The interior window is often dirtier than expected: plastic outgassing deposits an invisible film on the glass, which only becomes visible as a milky haze when exposed to glare.

Optionally, the final step is ceramic sealing with Ceramic ScheibenKlar 2 in 1: spray onto the dry exterior window, spread evenly, and let dry for five minutes. The protective layer lasts several days and significantly extends the intervals between cleanings. If you maintain your vehicle once a week, one Ceramic application per week will result in permanently protected, water-repellent windows. The effect is particularly noticeable in rain: water droplets form beads and are carried away by the wind at medium speeds.

For the ultimate fine-tuning – for example, if windows show blind spots, water stains, or fine scratches after years – the SONAX PROFILINE GlassPolish Glass Polish complements the system. It works chemically-mechanically with cerium oxide and micro-finely abrades the damaged glass layer to restore full transparency. After that, the ceramic sealant also adheres better because the surface is smoother and more uniform. This step is only necessary every few months or for visible glass damage – but it can make the difference between "clean" and "like new."

Regarding frequency: In summer, when insects accumulate on the windshield, manual cleaning with ScheibenKlar is recommended once or twice a week – ideally in the evening, when fresh insect residues are easier to remove than dried ones. The washer fluid works automatically during every drive. In winter, the cleaning frequency is higher (two to three times a week) because salt residues are more aggressive and impair visibility more significantly. The ceramic sealant can be renewed weekly if you want maximum protection – or once a month as basic care. The effort per application is only a few minutes, and the cumulative effect over weeks is noticeable: the windows remain clear longer, the wipers work better, and you brake less often due to poor visibility.

Another aspect many underestimate: the order of care steps influences the result. If you apply the ceramic sealant to an incompletely cleaned window, you seal in the dirt. Therefore, always clean first, then dry, then seal. And wait at least two minutes between ScheibenKlar and Ceramic ScheibenKlar to allow the cleaning formula to evaporate completely before the ceramic particles polymerize.

XTREME Window Care vs. Alternatives – Honest Assessment

Compared to cheap washer fluids from hardware stores, which usually rely on simple isopropanol and water, the XTREME window range offers noticeably more: better gliding for the wiper blades, an anti-resoiling effect that delays re-soiling, and corrosion protection for nozzles and lines. This costs more to purchase but pays off in the long run – wiper blades last longer, and you need to re-clean less often. However, if you are only looking for a simple washer fluid and have no long-term expectations, a hardware store product will also suffice. The difference is mainly noticeable over time: after a few weeks with a cheap washer fluid, you'll notice that the wiper blades wear out faster and the windows have a film again after just a few days. The XTREME formulas were developed to minimize precisely these long-term effects – the result is not only a cleaner window but also noticeably smoother wiper operation.

Compared to other premium glass cleaners such as Koch-Chemie GlassCleaner or Gyeon Q²M Glass products, XTREME ScheibenKlar stands out with its Pure-Water-Technology, which is specially optimized for streak-free drying without limescale residues. The Koch-Chemie and Gyeon glass cleaners are more economical as concentrates – those who clean large glass surfaces on many vehicles should compare the cost per liter. However, the real strength of the XTREME series lies in its system concept: no other manufacturer in the consumer sector offers glass cleaner, washer fluid, and ceramic glass sealant as a coordinated product line from a single source. This eliminates compatibility issues and significantly simplifies product selection – you don't have to research whether the cleaner and sealant are compatible.

When it comes to window sealing, XTREME Ceramic 2in1 clearly distinguishes itself from professional ceramic glass sealants like the SONAX PROFILINE CeramicCoating "CC" Glass: The professional sealant lasts up to 12 months but requires careful preparation with glass cleaner and degreaser, as well as professional application under controlled conditions. Ceramic 2in1, on the other hand, is designed for regular maintenance – it can be applied in just a few minutes, but offers a shorter durability. Both have their justification: CC Glass for long-term protection after detailing, Ceramic 2in1 for everyday maintenance between detailing. For most car owners who don't want to perform a professional glass sealant, Ceramic 2in1 is a much more accessible entry into ceramic protection for windows. A sensible middle ground: apply a CC Glass professional sealant once in spring and extend its durability throughout the year with regular Ceramic 2in1 touch-ups. This combines the durability of the professional solution with the ease of use of the consumer variant.

For whom is the XTREME series for windows and glass ideal?

The XTREME window care series is aimed at anyone who wants to systematically include windows in vehicle care – not just the paintwork. Detailing enthusiasts use the series as a finishing touch after paint care to complete the overall look with streak-free windows. Everyday drivers appreciate the uncomplicated application: spray ScheibenKlar, wipe, done. Frequent drivers and commuters particularly benefit from the 1:100 concentrate, which costs almost nothing per liter and supplies the washer fluid reservoir for months.

Commercial users with a fleet also find the right solution in the series: the concentrate is economical, ScheibenKlar is quickly applied, and the Ceramic 2in1 sealant offers protection that reduces maintenance effort between intervals. And even in the household, XTREME ScheibenKlar replaces conventional window cleaner – Pure-Water-Technology works just as effectively on windows, shower enclosures, and mirrors as it does on car glass. A system that works beyond the garage.

If you're unsure where to start: the XTREME ScheibenKlar as a single product is the lowest-threshold entry point. It costs little, is immediately ready for use, and shows you in its first application what differentiates Pure-Water Technology from a normal glass cleaner. From there, you can expand the system piece by piece – with the washer fluid for automatic cleaning on the go and the ceramic sealant for long-term protection. Or you can start directly with all four products and build your complete window care workflow from the beginning. In both cases, you get a system that is coordinated and in which each product has its fixed place.

By the way: Window care is one of the most underestimated aspects of vehicle care. While many car owners invest hours in paint polishing and rim cleaning, windows often remain an afterthought – even though clear windows not only look better but also directly influence driving safety. Glare from smeared interior windows in oncoming light, reduced visibility in rain due to non-beading water, or salt haze on the windshield in winter – all of this can be avoided with proper window care. The XTREME series makes it as easy as possible for you to consistently integrate this often-neglected part of car care into your workflow.