Northerner,
Unless you get a used CPAP from someplace like
www.awakeinamerica.org, you do not know what you are getting (you might want to check them out). You may get a CPAP which is not performing well or up to specifications or is not providing an accurate pressure and you have no way to check its performance.
Buying a used mask and hose is a very bad idea. The main purpose of rinsing our equipment with vinager is to get rid of any mineral build up. It might be a little bacterial static (inhibits bacterial growth), but I doubt it is very effective at killing bacteria, fungi or viruses. Masks are not designed to be put in the dishwasher and if you use the heated drying cycle, you would probably end up with a lump of plastic.
Bacteria, viruses and fungi can be much harder to kill than people realize. That is why the medical profession sterilizes everything with an autoclave.
One bug (of many) I'd be particularly concerned about catching is TB. It is very hard to kill.
Vicki
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Being defeated is often a temporary condition. Giving up is what makes it permanent.
Marilyn Von Savant
That which does not kill you makes you stronger-Friedrich Nietzsche
Friedrich must of had apnea.