I clean my face cushion, headgear, and hose with bleach every morning after I wake up. This ensures that it kills all the bacteria from my drooling into the mask. I also clean out the reservoir with bleach so that no algae forms in the water. I hope that I will prevent lung infections from bacteria buildup but it seems I keep developing an infection anyway from some kind of burning bacteria inside my lungs. I doubled the amount of bleach used but seems to help a little. Hopefully it will subside.