--- product_id: 206019735 title: "831991L Windscreen Washer Additive, 1 Litre" brand: "rain-x" price: "€ 25.42" currency: EUR in_stock: true reviews_count: 13 category: "Rain X" url: https://www.desertcart.fr/products/206019735-831991l-windscreen-washer-additive-1-litre store_origin: FR region: France --- # 1 Litre high-performance additive Streak-free advanced cleaning formula Rain-repellent hydrophobic coating 831991L Windscreen Washer Additive, 1 Litre **Brand:** rain-x **Price:** € 25.42 **Availability:** ✅ In Stock ## Summary > 🚗 Clear roads, clearer mind — drive with confidence every season! ## Quick Answers - **What is this?** 831991L Windscreen Washer Additive, 1 Litre by rain-x - **How much does it cost?** € 25.42 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.fr](https://www.desertcart.fr/products/206019735-831991l-windscreen-washer-additive-1-litre) ## Best For - rain-x enthusiasts ## Why This Product - Trusted rain-x brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Streak-Free Finish:** Leaves no smudges or streaks, reducing glare and improving driving comfort day and night. - • **Hydrophobic Rain Shield:** Applies a water-beading rain-repellent coating with every use for enhanced wet-weather visibility. - • **Long-Lasting Protection:** Prevents dirt and debris buildup, keeping your windscreen cleaner for longer and reducing wiper wear. - • **Universal Compatibility:** Seamlessly integrates with all windscreen washer systems for hassle-free use across all vehicle types. - • **Year-Round Crystal Clear Vision:** Superior cleaning power that removes insect residue, tree sap, bird droppings & road grime effortlessly. ## Overview Rain-X 831991L Windscreen Washer Additive is a 1-litre, high-performance formula designed to deliver streak-free, spotless windscreens year-round. It effectively dissolves tough contaminants like insect residue, tree sap, and road grime while applying a hydrophobic rain-repellent coating that enhances water beading and runoff. Compatible with all windscreen washer systems, this additive boosts visibility, reduces wiper use, and keeps your glass cleaner longer for safer, more comfortable driving in all weather conditions. ## Description Keeping a windscreen spotless and free from obstructions is essential for safe driving, and this high-performance windscreen washer additive ensures optimal clarity in all conditions. Engineered with advanced cleaning agents, the formula effectively removes insect residue, tree sap, bird droppings, and road grime, restoring the glass surface to a streak-free, crystal-clear state. With its powerful cleaning action, even the most stubborn contaminants are dissolved effortlessly, reducing the need for manual scrubbing and preventing stains that could impair visibility. Beyond its impressive cleaning properties, this screenwash additive also applies a rain-repellent coating to the glass every time the washer system is activated. This hydrophobic barrier enhances water beading, causing rain to roll off quickly and reducing the reliance on wipers during heavy showers. The water-repellent effect not only improves visibility in wet conditions but also helps keep the windscreen cleaner for longer by preventing dirt and debris from sticking to the surface. Designed to leave no streaks or smudges, this formula guarantees a flawless finish that enhances visibility day and night. Unlike conventional washer fluids that can leave behind distracting residue, this additive ensures that the windscreen remains crystal clear, reducing glare from headlights and sunlight. Whether driving in bright daylight, foggy conditions, or at night, the result is a more comfortable and safer driving experience with uninterrupted road awareness. Ease of use is another key advantage, as this washer additive is fully compatible with all windscreen washer systems. It blends seamlessly with both water-based and pre-mixed washer fluids, offering a hassle-free solution for maintaining superior windscreen clarity. Whether facing extreme weather conditions or everyday road grime, this product delivers year-round performance to keep windscreens spotless and visibility at its best. With its combination of powerful cleaning properties, rain-repellent technology, and streak-free results, this windscreen washer additive is an essential addition to any vehicle maintenance routine. It ensures that drivers can maintain a clear, unobstructed view of the road, enhancing both safety and comfort in all driving conditions. Review: Effective additive for car washer bottles - If you get smearing on your windscreen then this is the ideal product! You simply add a small amount to the cars washer bottle and the solution results in a very clear windscreen with water simply beading off the screen, much improving the visibility. The solution is also effective at removing bug residue and seems to stick to the screen that it is effective for quite a while. For the amount you get and the ease in which it removes road-film, this is a value for money product. Highly recommended. Review: Great stuff - Why did you choose this product over others?: Living in the moist mildewy climes of scotland ,where summer is probably 2 weeks in may and thats it, windscreen wipers are fairly important. I used the karate kid wipe on wipe off rain x and found it to be superb . On side windows it would last for months . On the windscreen ....not so much . Impressive but after a bit of wiper action ,meh. While blethering with some web toed comrades i was extolling the virtues of said rain x to a motor cycle helmet wearer , it came up about the rain x screen wash . Now i didnt know this stuff existed and last screen wash i had stank of bubblegum and has put me off bubblelisous for life. After a trip into the desertcart and delivered nxt day (sooooperb) ,i was taken back a bit about size of bottle ,it was a bit small compared with the foul smelling radioactive gallon i was used to. So having thouroghly scanned and not read the instructions ,sniffed the bottle (ok) i put a scotsmans amount in ,mabey about a quarter mabey... it works well . Cleaned the grime ,streak free ,didnt smell and had the water beading of the hard work stuff . Been a few weeks and im still impressed by it . We will see if the more winter times need a more potent mix ,i will have no probs getting this again . ## Features - Flammable liquid and vapour. - ✅ REVOLUTIONARY FORMULA FOR YEAR-ROUND WINDSCREEN CLEANING: Designed to provide superior cleaning performance in all seasons, this advanced washer additive ensures that dirt, grime, and other contaminants are effortlessly removed from the glass surface. The powerful cleaning agents break down stubborn residues, including insect splatters, tree sap, bird droppings, and road grime, without leaving streaks. Regardless of weather conditions, this solution delivers a spotless finish that enhances visibility and driving safety. Engineered for all types of vehicles, it integrates seamlessly into any windscreen washer system, ensuring reliable performance with every application. - ✅ EFFECTIVE REMOVAL OF INSECT RESIDUE, TREE SAP, BIRD DROPPINGS & ROAD GRIME: Tough road contaminants can obscure visibility and make driving hazardous. This specially formulated additive tackles even the most stubborn dirt, breaking down and lifting dried-on insect remains, sticky tree sap, and heavy road grime. Bird droppings, which can cause permanent stains if left untreated, are swiftly dissolved without the need for excessive scrubbing. - ✅ APPLIES RAIN REPELLENT COATING WITH EVERY USE: With every application, this washer additive delivers a hydrophobic protective layer that enhances water beading and runoff. The rain-repellent coating allows water to roll off effortlessly, significantly improving visibility during heavy downpours. By reducing the need for constant wiper use, especially at high speeds, it enhances safety and driving comfort. This invisible barrier also prevents dirt and debris from adhering to the glass, making future cleaning much easier and keeping the windscreen in optimal condition for longer. - ✅ STREAK-FREE FORMULA FOR IMPROVED VISIBILITY AND DRIVING COMFORT: Unlike conventional washer fluids that leave behind smudges and streaks, this advanced formula ensures a flawless finish with every use. Streak-free performance guarantees crystal-clear glass, reducing glare and reflections that can hinder visibility. Whether driving at night, in foggy conditions, or under direct sunlight, the result is a consistently clear view of the road. By eliminating residue build-up, this washer additive enhances both safety and driving comfort, allowing for a more relaxed and confident journey. - ✅ COMPATIBLE WITH ALL WINDSCREEN WASHER SYSTEMS FOR EASY USE: This high-performance additive is designed for effortless integration into all windscreen washer systems. Simply mix it with the existing washer fluid to instantly boost cleaning power and apply the rain-repellent effect. Suitable for use with both water-based and pre-mixed washer fluids, it delivers outstanding results in all weather conditions. Whether driving through scorching heat, heavy rain, or freezing temperatures, this formula ensures a pristine windscreen for enhanced visibility and a safer driving experience. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B088KL1T4V | | Best Sellers Rank | 1,664 in Automotive ( See Top 100 in Automotive ) 16 in Screenwash 23 in Antifreeze & Coolants | | Brand | Rain-X | | Customer Reviews | 4.6 4.6 out of 5 stars (1,171) | | Date First Available | 13 May 2020 | | Delivery information | We cannot deliver certain products outside mainland UK ( Details ). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout. | | Item Weight | 1.01 kg | | Item model number | 831991L | | Manufacturer | Rain-X | | Manufacturer part number | 831991L | | Model | Rain-X Screenwash Additive | | Product Dimensions | 8.5 x 8.5 x 23 cm; 1.01 kg | | Special Features | Streak Free | ## Images ![831991L Windscreen Washer Additive, 1 Litre - Image 1](https://m.media-amazon.com/images/I/71TomDGgW5L.jpg) ## Questions & Answers **Q: Can you use this by itself or does it have to be mixed with screen wash** A: I thought it was a screen wash so always use it diluted with tap water. It has works extremely well. **Q: Can i mix this with other screenwash?** A: Yes you can. I tend to add about 1/4 bottle to a full tank of screen wash. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Effective additive for car washer bottles *by I***K on 20 May 2025* If you get smearing on your windscreen then this is the ideal product! You simply add a small amount to the cars washer bottle and the solution results in a very clear windscreen with water simply beading off the screen, much improving the visibility. The solution is also effective at removing bug residue and seems to stick to the screen that it is effective for quite a while. For the amount you get and the ease in which it removes road-film, this is a value for money product. Highly recommended. ### ⭐⭐⭐⭐⭐ Great stuff *by T***T on 29 June 2025* Why did you choose this product over others?: Living in the moist mildewy climes of scotland ,where summer is probably 2 weeks in may and thats it, windscreen wipers are fairly important. I used the karate kid wipe on wipe off rain x and found it to be superb . On side windows it would last for months . On the windscreen ....not so much . Impressive but after a bit of wiper action ,meh. While blethering with some web toed comrades i was extolling the virtues of said rain x to a motor cycle helmet wearer , it came up about the rain x screen wash . Now i didnt know this stuff existed and last screen wash i had stank of bubblegum and has put me off bubblelisous for life. After a trip into the amazon and delivered nxt day (sooooperb) ,i was taken back a bit about size of bottle ,it was a bit small compared with the foul smelling radioactive gallon i was used to. So having thouroghly scanned and not read the instructions ,sniffed the bottle (ok) i put a scotsmans amount in ,mabey about a quarter mabey... it works well . Cleaned the grime ,streak free ,didnt smell and had the water beading of the hard work stuff . Been a few weeks and im still impressed by it . We will see if the more winter times need a more potent mix ,i will have no probs getting this again . ### ⭐⭐⭐⭐ hope it works well *by A***. on 10 October 2024* i have been using the 200ml bottles of rainex for a few years now and its great for expelling water and giving better visability when raining. i am hoping this additive will make that initial treatment last longer than the 2-3 months i usually get. i decided to try the additive instead of the mixed wash because you can use 5lrs of screen wash pretty quick in winter removing salt from the screen or bugs in the summer, i am hoping that since this is made by rainex, they have solved the issue of normal screen wash just beading up and getting repelled from the screen and thus having the inability to remove bugs in summer. removing salt has never been an issue when using rainex since salt absorbs water. would recommend rainex repellent treatment anytime. will update after real testing ## Frequently Bought Together - Rain-X Windscreen Washer Additive - Streak-Free Cleaning & Rain Repellency Screenwash - Removes Bugs, Sap & Road Grime - Enhances Visibility & Driving Comfort - 500ml - Rain-X 2-in-1 Glass Cleaner + Rain Repellent – Streak-Free Shine & Advanced Water Beading – Helps Protect Against Rain, Snow, Ice & Insects – Quick & Easy Spray Application – 500ml - Rain-X RTU Screenwash with Insect Remover & Rain Repellent - Streak-Free Windscreen - Hydrophobic Technology for Superior Rain Protection in Summer - Prevents Bacteria & Enhances Visibility - 5L --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.fr/products/206019735-831991l-windscreen-washer-additive-1-litre](https://www.desertcart.fr/products/206019735-831991l-windscreen-washer-additive-1-litre) --- *Product available on Desertcart France* *Store origin: FR* *Last updated: 2026-04-24*