@cynthiajewell7 Here is how we have handled nebulizer tubing for over 30 years:
Let the compressor run for 5 minutes with the mouthpiece detached.
Biweekly I wash the hose in hot soapy water, then soak in alcohol for 15 minutes, and after shaking out the liquid, dry with the compressor. I use alcohol because it dries out easily, if you want to avoid it, you could do a full-strength vinegar soak instead.
I have always replaced tubing and mouthpiece every 6 months, but now am thinking to up that to every 3 months. If I was concerned about humidity and moisture remaining, I would probably up the alcohol soak to weekly and definitely replace at 3 months.
Edited to add - my Mom, myself & both kids, my brother as well as numerous nieces and nephews, are/were asthmatic. In addition, Mom had bronchiectasis, no doubt from 40 years of exposure to paper dust and printing chemicals. I also have bronch, and so does my 40 yo daughter. So we have had LOTS of experience with nebulizers, beginning with one that weighed about 12 lb and cost $600 back in the 1980's.