[petejansson]

A few years ago, there were a number of devices that came on the market that essentially blew ozone through the airflow pathways in PAP devices, and this was supposed to be a substitute for disassembly and scrubbing (which is a lot less convenient). While nobody has said these devices and the ozone methods actually damaged the foam, replacement PAP units all are not warranted if ozone cleaning devices are used. I don't know if this is the only "cleaning material" to which the article refers.