I’ve used a mild bleach solution to do my BCD oral inflator, hose, and inside the bladder. Lots of freshwater rinsing afterwards. I use Listerine or like product or mild bleach solution for my reg, fresh water rinse to keep it from gumming up. Then I dip only the mouth piece in listerine to kill any germs on the mouth piece, then you have a fresh tasting mouth piece for your next dive.