ZEP Commercial 32 oz. Mold stain & Mildew Stain remover is a ready-to-use industrial strength formula that quickly dissolves mold and mildew stain with the power of bleach. This easy to use formula allows you to simply spray and rinse clean. ZEP Mold stain and Mildew Stain Removers is safe for use in toilet bowls, sinks, tubs and surfaces as ceramic tile, fiberglass, acrylic and grout. Industrial strength formula quickly dissolves mold stains and mildew stains with bleach Whitens fiberglass, tile and grout Safe on most surfaces such as toilet bowls, urinals, plastic (unpainted)awnings Ready to use