Sparkle Glass Cleaner does those glass cleaning jobs too tough for spray-on cleaners. It removes light water spots and stains in glass caused by weather, sea air, or pollution to make old glass shine like new. It also removes soap scum from shower doors and ceramic tile.
Simply wipe on with a damp cloth or paper towel, rub stained areas, then let it dry to a haze for few minutes and wipe it off. Works just like waxing a car.