This new, extra-strength formula instantly removes black mildew and green and yellow mold stains from all surfaces. Removes mold, mildew and soap scum from tile, grout, showers, tubs, locker rooms, bath mats, shower curtains, mold-stained walls and ceilings. Outdoor uses include cemetery monuments, mausoleums and headstones; canopies, awnings, outdoor furniture, wood fencing, railroad ties, and more. Use Moldy Locks prior to applying one of our disinfectant cleaners to eliminate dangerous mold and help stop re-growth. Not intended for soft fabrics where colorfastness is a concern.