A windshield washer is a system in vehicles designed to clean the windshield for better visibility. It typically consists of a reservoir that holds washer fluid, a pump that sprays the fluid, and nozzles that direct the fluid onto the glass. When activated, the system helps remove dirt, grime, and other debris from the windshield. The washer fluid used in a windshield washer is often a mixture of water and cleaning agents, which can help prevent freezing in cold weather. Regular maintenance of the windshield washer system is important to ensure it functions properly, especially during adverse weather conditions.