Any teardowns? Everyone fixing electronics/cars knows about foam crumbling to dust with age/external factors like heat.
The best thing is that third party manufacturers are making their own replacement parts for people to DIY repair their own machines and just have zero sound-deadening foam in them.
I'm in the recall, I refuse to use the reworked unit they sent me because it's a goddamn used CPAP first and foremost in the age of COVID -- I reworked my own machine instead. It wasn't a bad replacement project, I took my time - the sellers even provide in some of the kits all the tools you need, full color booklets, and video guides on Youtube on how to crack them open and swap it out.
I wonder if "cleaning materials" means a chemical, like a spray, or something different.
https://www.fda.gov/medical-devices/safety-communications/ce...
https://www.fda.gov/medical-devices/safety-communications/up...
but I believe that more than anything else is the quality of this PE-PUR foam that is lacking.
[1] ozone sanitizing treatments have been found to damage a lot of materials (besides metal which oxidizes very quickly also rubbers) and actually ozone chambers are used to test rubber materials durability