Can I Add Water to Windshield Washer Fluid?
2 Answers
Adding water to windshield washer fluid is not recommended. Windshield washer fluid, also known as car window cleaning solution, serves multiple purposes beyond just cleaning, including lubrication, antifreeze, anti-fogging, and anti-static properties. While adding water may partially achieve a cleaning effect, tap water often contains impurities that can corrode rubber hoses and clog nozzles over time. Currently, there are three types of windshield washer fluids available: one for summer use, which contains not only standard cleaning agents but also insect-removing compounds to quickly eliminate insect residues on the windshield; another for winter use, featuring antifreeze properties that allow it to function normally at temperatures as low as -20°C, preventing freezing and even melting ice and snow to some extent; and a third type designed for extremely cold regions, capable of remaining unfrozen even at -40°C.
As someone who has worked in the workshop for years, I've seen many cases where car owners use water as a substitute for windshield washer fluid. Adding water as a temporary solution is acceptable, especially in emergencies when you run out of washer fluid—using purified or distilled water to briefly rinse the windshield can help. However, it's important to remember that water lacks the detergents and antifreeze components found in professional washer fluid. Long-term use of tap water can lead to sediment buildup, clogging the spray nozzles, and in winter, it may freeze and damage the reservoir. The cost of repairing or replacing nozzles is much higher than buying a bottle of proper washer fluid, so don't take the risk just to save money. Additionally, in areas with poor water quality, the problems are even worse—algae or impurities can accelerate nozzle deterioration. Develop the habit of regularly replacing your windshield washer fluid with products from reputable brands to keep your windshield clear and ensure safe, unobstructed driving visibility.
