Sterisol is the perfect cleaner and conditioner for Scuba and Snorkel mouthpieces! Sterisol is completely safe and, when used as directed, will clean and deodorize mouthpieces including removing mold and fungus that may be lurking on rental equipment. Sterisol is completely safe for all plastics, rubbers and silicones and will not affect regulator diaphragms. Sterisol is ideal for reducing odors in closed breathing apparatus.