Do hospitals still even have autoclaves anymore?
How about misting the masks with isopropyl? It is a pretty good sterilization agent (the active ingredient in that Hand Sanitizer people use instead of handwashing). It’s cheap and readily available. Easy to apply…. one could easily wet the surfaces with a mist using a simple airbrush. (might need ventilation as the fumes can be flammable) and let them dry for a few hours.
Of course, they could just stop using the masks ONCE for each time they enter and then leave the room….but yes, I know…”Protocol”. But that protocol assumes an unlimited supply of those masks. Now that supply is finite. so one would think they would change that “Protocol”.