Dissolve mold and mildew stains with the power of bleach. This stain remover is safe for use in toilets, sinks, tubs and ceramic tile, acrylic, and fiberglass surfaces. Application: Mold & Mildew Stain Remover; Applicable Material: Ceramic Tile; Fiberglass; Grout; Porcelain; Sinks; Toilets; Chemical Compound: Sodium Hypochlorite; Dirt Types: Mildew; Mold; Soap Scum.