Removes tough water spots lime and scale organic stains mold and mildew stain rust and more. A unique formula containing hard working detergents, and mild "jeweler's grade abrasive" and oxygen bleach. Removes years of unwanted hard water deposits and stains on glass, windows and shower doors. THE ONLY SAFE PRODUCT TO USE ON FIBERGLASS AND ACRYLIC SHOWERS AND TUBS. 20 oz.