Iron OUT(R), the #1 heavy-duty rust stain remover powder, is specifically formulated to easily rinse away the toughest rust stains, eliminating the need for scrubbing. This multi-purpose and versatile powder is ideal for use in removing and preventing difficult rust stains in bathrooms, kitchens, appliances, laundry, water softener maintenance and many more applications in and around the home. Ideal for geographic regions with hard water and high iron.