Car glass can be difficult to clean compare to household glass surfaces. Automotive windows are regularly exposed to contaminants. The exterior is subject to bugs, grease, road oils, salts, dirt and tree sap. The interior is subject to smoke, pet slobber, dirt, grease and finger prints. 5k Car Care Quick & Easy Dash & Glass makes is easy to clean both the exterior and interior of car glass without the worry of overspray on other components of the car.