Cleans mildew & prevents mildew & mold stains from returning. Allergist recommended. Patented formula. No harsh fumes. Say goodbye to mold and mildew. DampRid Mildew Stain Remover Plus Blocker is made with a unique patented formula that removes mildew stains and provides effective long-term mold & mildew stain prevention. It's the only formula that cleans mildew stains, soap scum and mineral deposits (like calcium and lime) and prevents mold & mildew stains from returning. DampRid Mildew Stain Remover Plus Blocker is safe to use indoors and outdoors on aluminum, glass, fiberglass, stone (except natural marble) cultured marble, acrylic, pvc, vinyl, porcelain, rubber, chrome, plastic, shower curtains, formica and more. Its long-term effectiveness is not diminished by repeated washing or, for outdoor use, exposure to rain. Safe for the environment. Because DampRid Mildew Remover Plus Blocker contains no bleaches or acids, there are no harsh toxic fumes to harm you, your family or your pets. You can work with it easily in small confined spaces. DampRid Mildew Stain Remover Plus Blocker won't corrode or stain aluminum shower door frames or attack rubber, vinyl or paint. Gloves aren't needed when handling! It contains no bleach and it's septic safe. Mold armor inside. Blocks mold & mildew. Made in USA.