Zep Mold Stain & Mildew Stain Remover Gel uses the power of bleach to clean tough mold and mildew stains in cracks, crevices, and other hard-to-reach areas. The thick gel formula clings to vertical surfaces such as washer seals, refrigerator seals, caulk, and grout, while the long-nose nozzle helps deliver precise application in tight spaces including dishwasher seals and gaskets. Safe for use on appliance seals, silicone, caulk, rubber gaskets, grout, tile, showers, and sinks. Simply apply, wait, and wipe away for effective cleaning without heavy scrubbing.