@merpreb The industry is working on washable N95 masks (my sister works at 3M) but I don't believe there are any on the general market yet. One of the issues is that water alters the structure of the non-woven fabric used in the masks, which can render them ineffective. In hospitals where masks are being cleaned and reused, the only approved methods I know of right now are aerosol peroxide in a special chamber and UV light, again in a special room and for a specific time. Even those methods may on;y be used a limited number of times before masks must be discarded.
My dentist's office hygenissts and docs wear KN-95 under a cloth or disposable mask, with the cloth or disposable changed between patients, and the KN-95 being worn for a couple of days. (I was there yesterday and asked specifically.)
Sue