Hikaru Silicone Mold Be Gone Kills Mold Silicone Imported Kills mold and mildew spores from bathtub and sink silicone caulking. Gel penetrates the mold spores, sterilizes, and bleaches. Leaves bathtub and sink silicone sealant amazingly clean. Effective 1 year , No Odor, Superior Working, Gel type