Windshield washer fluid (also called windshield wiper fluid, wiper fluid, screen wash (in the UK), or washer fluid) is a fluid for motor vehicles that is used in cleaning the windshield with the windshield wiper while the vehicle is being driven.
If the vehicle is operated in temperatures below 4°C, use a windscreen washer fluid with frost protection. In cold weather, failure to use a windscreen washer fluid with frost protection could result in impaired vision and increase the risk of a vehicle crash.
Do not use engine antifreeze or a water solution in the windscreen washer reservoir. Antifreeze damages painted surfaces, while vinegar can damage the windscreen washer pump.