Windshield washer fluid contains additives that not only help keep windows clean in bad weather, but also keep the fluid from freezing in cold weather, just when the windows need to be cleaned the most. Do not fill the tank with clean water, because the liquid will freeze in the cold.
Never use antifreeze on this circuit if you don't want to damage the car's paintwork.
1. The filler neck of the windshield/headlight washer reservoir is located in the right front corner of the engine compartment. The fluid level is visible through the walls of the reservoir. If you need to add fluid, unscrew the reservoir cap.
2. Fill with water and add detergent according to manufacturer's recommendations.