Glass and Metal Magic is a product design to remove hard water deposits safely. Apply Glass & Metal Magic onto a damp microfiber cloth, rub into a towel, gently rub polished brass. Rejuvenates your shower glass to a transparent window (just like when you first moved in) by removing frustrating mold and tarnishing minerals. Glass & Metal Magic polishes the fixtures to an illuminating mirror effect without harming any surrounding polished travertine/marble/limestone in the shower, on the floor or the counter top. Without the use of Glass & Metal Magic, only a professional restoration company would be able to revamp your old shower door and fixtures to look brand new again.