Various ideas came out of a discussion on Mask Cleaning on CPAPtalk.
Cidex OPA is a powerful (and possibly dangerous) disinfectant available from medical suppliers and on the Internet Hybrid recommends Cidex Pro for cleaning masks between users. Also Bravo has a Videoshowing the use of Cidex Pro

Another user washed in dawn dishwashing liquid, rinsed well, soaked in vinegar and water solution for 15 minutes and then rinsed very well

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