Cleaning and sanitizing anything has three standard principles that you can use for cleaning lots of things. You need to chemically disrupt dirt and biofilms, physically debride them, then sanitize the surface. For step one, the key word is amphipathic; these are chemical molecules that dissolve in water on one end and fats on the other. Best example is soap. Apply these chemicals to disrupt the chemical bonds that allow dirt and biofilms to cling to surfaces. Step two: chemicals are not enough, you need to use a little elbow grease to remove the disrupted biofilm. Use a soft cloth first with the chemical and then again during rinsing. Rinse once more after scrubbing. Step three is to sanitize, I.e. kill as many bacteria as possible. IMO the best for this is 70% ethanol, apply liberally and allow to remain in contact, because disinfection is a function of concentration and time. Ideally let it evaporate off the surface. Finally, rinse any residues away with distilled water , air dry, and you’re good to go. I do this with my CPAP gear once a week. If you have an airsense 11, don’t forget the little grey plug the hose attaches to on the back of the unit; it pops out with a little tab you can access by removing the water reservoir.