Does Car Windshield Washer Fluid Have an Expiration Date?

[DiGiselle]

Car windshield washer fluid does have an expiration date, typically 2 or 3 years for most products. High-quality automotive windshield washer fluid is primarily composed of water, alcohol, ethylene glycol, corrosion inhibitors, and various surfactants. The surfactants usually possess functions such as wetting, penetrating, and solubilizing, thereby achieving the purpose of cleaning and removing dirt. The presence of alcohol and ethylene glycol in the washer fluid can significantly lower the freezing point of the liquid, providing an antifreeze effect and quickly dissolving frost. After washing, the washer fluid forms a monomolecular protective layer on the glass surface. This protective film prevents the formation of fog droplets, ensuring the windshield remains clear and transparent with unobstructed visibility. Additionally, substances adsorbed on the glass surface after washing can eliminate static charges on the glass surface.