Can Windshield Washer Fluid Expire?

[LaIsabelle]

Windshield washer fluid does have an expiration date. Expired windshield washer fluid should not be used, as it will no longer function effectively. Unlike plain water, which only serves a cleaning purpose, high-quality windshield washer fluid is primarily composed of water, alcohol, ethylene glycol, corrosion inhibitors, and various surfactants. Functions of windshield washer fluid: Surfactants typically have wetting, penetrating, and solubilizing properties, which aid in cleaning and removing dirt. Anti-fogging: A single-molecule protective layer forms on the glass surface. This protective film prevents the formation of fog droplets, ensuring clear visibility through the windshield. Anti-static: After cleaning with washer fluid, substances adsorbed on the glass surface can eliminate static charges on the glass. If the windshield washer fluid has expired, it is recommended not to use it. No matter how high-quality the fluid is, once it expires and deteriorates, it loses its intended functions. When purchasing windshield washer fluid, car owners should first check whether the product is past its expiration date. Secondly, they should look for any sediment in the fluid, as its presence indicates that the fluid has deteriorated.