Sticks to mildew! Bleaches away stains! The gel formula sticks to mildew with bleaching power to clean away the toughest mildew stains! Cleans tough mildew stains easily and conveniently while the gel formula helps to reduce bleach fumes, making it more pleasant to use. Great for use on grout, tile (glazed and unglazed ceramic), tubs, showers, shower doors, vinyl curtains, basins, sinks, fiberglass, plastics and vinyl. Avoid prolonged contact with metal or old porcelain. Do not use on wood, painted surfaces, marble, or aluminum. Avoid contact with clothes, fabrics, carpets or paper surfaces to prevent potential discoloration. For all other surfaces, before using this product perform a spot test in an inconspicuous area. Made in USA.