The doctor or nurse probably won't be able to do that process everytime they use the mask. Like other reusable hospital supplies it will be collected somewhere

The doctor or nurse probably won't be able to do that process everytime they use the mask. Like other reusable hospital supplies it will be collected somewhere to be cleaned in bulk. The point above is that so many will be used in a short span of time that even a 24 or 12 hour cleaning rotation will not keep up without large numbers being available.