There was a recall on Philips CPAP machines if the user had utilized one of those cleaners like the "So Clean" units. The CPAP cleaners use ozone generators to "clean and sanitize" the mask and tubes, but Philips found that these machines were degrading and damaging the mask and tubes and causing all kinds of nasty chemical reactions that are dangerous to humans. Seems to me that you wouldn't want to use something like that (ozone generator) on anything you even come in contact with, let alone consume.