Invisible barrier to mold and mildew growth. Mildew and mold blocker binds to both hard and absorbent surfaces to form a durable, invisible coating that inhibits the growth of mold and mildew and prevents the accompanying deterioration, stains, and odors they cause. Spray mildew and mold blocker directly on the surfaces to be protected and allow to dry. Odor free. Properly applied, it protects up to 6 months or more. Use mildew and mold blocker on clothing, bedding, furniture, and drapes every 6 months and before extended absences. It's great for lawn furniture, roofs, driveways, and more. It also works in AC ducts and vents to help with allergens and mold. Spray blocker on water-exposed surfaces like tiles, tubs, grout, and shower curtains weekly to replenish barrier. 32 oz. spray bottle.