ZEP 128 oz. Mold Stain and Mildew Stain Remover is a ready-to-use formula that quickly dissolves mold and mildew stains with the power of bleach. This easy to use formula allows you to spray and rinse surfaces clean. This mold and mildew remover is an excellent bathroom cleaner for eliminating dirt, stains and grime on toilet bowls, sinks, tubs and more. With the professionally concentrated bleach level, this mold and mildew stain remover leaves grout and surfaces whitened. This gallon cleaner can be used in one of our Zep Spray Bottles for an easy, refillable solution. Pro Tip: For severe buildup, scrape away loose material before applying cleaner.