Treated surface becomes water repellent which makes it easier to clean by avoiding chemical deposits on windows, windshields and other crystals. For windshields, windows, mirrors, automotive crystals, etc. Repels liquids and oils, faster drying time, easy-to-clean properties, prevents the adhesion and incrustation of bugs and bird droppings, increases visibility under rain dramatically, makes rain drops slide of when driving over 40 mph.