Can tap water be added to windshield washer fluid?
2 Answers
Tap water should not be added to windshield washer fluid. Tap water contains a significant amount of impurities, which over time can adhere to the rubber hoses and affect normal spraying. Long-term use may increase friction between the windshield and wipers, causing scratches on the glass. Plain water can only remove dust superficially and lacks the ability to thoroughly clean dirt and insect residues on the windshield. Windshield washer fluid is made from deionized water with various eco-friendly additives, providing functions such as cleaning, antifreeze, antistatic, and anti-corrosion. Some higher-quality washer fluids also offer features like rapid snow and ice melting, anti-glare, and anti-fog properties, significantly enhancing driving safety.
As someone with years of driving experience, I have some thoughts about windshield washer fluid. Using tap water may seem cost-effective and convenient, but it's definitely not a good idea. Automotive windshield washer fluid is specifically designed to clean windows, prevent freezing, and resist corrosion. Ordinary tap water contains minerals and impurities that can clog the nozzles over time. Last winter, I encountered this issue myself—the nozzles got blocked, the fluid wouldn't spray, and it severely compromised visibility, which was extremely dangerous. Even worse, in cold regions, water can freeze, damaging the entire system and leading to higher repair costs. While tap water might work as a temporary emergency solution, it’s absolutely not recommended for long-term use from a safety standpoint. It’s best to use professional windshield washer fluid—it only costs a few dozen yuan per bottle, which isn’t expensive. Regular checks and replacements can save a lot of hassle. Car maintenance is all about prevention; don’t risk driving safety over small savings.
