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: Tile; Tubs; Showers; Applicable Material: Fiberlass; Grout; Chemical Compound: Sodium Hypochlorite; Bleach; Dirt Types: Mold; Mildew.