Mold & Mildew Stain Remover quickly removes mold and mildew stains on grout. Penetrates problems areas almost instantly, leaving non-porous surfaces clean and mildew stain free. Mold & Mildew Stain Remover harnesses the cleaning power of an inhibited hydrochloric acid coupled with a surfactant to effectively lift mold stains and prevent their reocurrence. With regular use this product will create an acidic environment which is not favorable for the growth of common mold species. Safe to use on porcelain, ceramic tile, and fiberglass. Eliminates: Mold stains, soap scum, dirt and hard water build-up. Safe and user friendly. Low VOC and does not create harmful fumes. Pleasant, low impact odor for use in confined spaces.