When you clean mold and mildew, you can make the clean last longer with Mold Armor Mold Blocker. Mold Armor Mold Blocker provides protection from mold and mildew staining when properly applied. Mold Armor Mold Blocker establishes a barrier between most household non-porous surfaces and bacteria and mold and mildew that cause odor, staining and discoloration. It's a water-resistant anti-microbial and odor-free product that provides protection indoors and out. It works continuously for up to 3 months. Use it indoors and out – its effectiveness can’t be diminished by repeated washings or rain.