Simple and Quick, instantly removes mold stains and mildew stains. Removes mold stains without scrubbing, sanding or wire brushing and works on most surfaces: Wood, Concrete, Drywall, Siding, Tile & Grout, Fiberglass, Vinyl and More. Works great all around your Home. It’s amazing on Boats too, and does not kill your expensive plants!! Powerful bleach-based formula renews, restores and protects 200-400 square feet per gallon when sprayed according to specification.