It is a cleaner and antifreeze for your windshield. Regular use prevents the freezing of your windshield and headlight washer systems. This is vital in cold weather to keep your windshield clear of fog, ice, salt, and oil calcium inhibitors prevent deposits that cloud your visibility windshield stays clean and clear no matter what the conditions are outside. Cleans and protects the windshield. Protects and lubricates the wiper rubber. Creates a protective membrane on the surface of the windshield.