The problem with rubbing alcohol is that it kills ALMOST everything, not everything.  This can actually make things worse, because you're killing off weak bacteria, and letting the strong stuff live.  I remember reading an article about how cleaning your kitchen counters with alcohol can end up growing really nasty bacteria on it in the long run.  I would go for chlorine free bleach (really strong hydrogen peroxide) and maybe a couple times a year switch it up with some regular bleach or some brewing sanitizer like star-san--just to make sure if something is living through one sanitizer, it can't get hold.   Another thing you can do to help prevent problems would be to keep your mask in a tupperware with some silica gel after you wash it so that moisture is quickly gone and bacteria doesn't have a chance to start.

Warm soapy water......disassemble, soak, rinse and air dry......

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Not if you buy an O₂ptimask at the ch.com store. I've had all three of mine for over two years now.

Of course, I haven't had to use any of them for quite some time now.