Don 't know about the grassmowing masks but any that are not cloth will breakdown with repeated santizing.
I have some cloth ones that the GF got me from her medical office. After a day or two of use (you get to learn "your smell") you can wash them with a little bit of Woolite and a dab of bleach. Hang up to drip dry.
I noticed while at MCAS Cherry Point yesterday that all active duty Marines were wearing khaki-colored neck warmers pulled up to cover the bridge of their nose. As I'm a year-round Gold Wing rider I have a couple of black neck warmers. A check with my GF and she said it was okay to wear them but to remember to wash, as above, every other day.
Remember the term "Stay Safe" has taken on a whole new meaning this year.
YNCM USN-Retired (64-90)
RVN (Tet 68)
2015 Thor Vegas 24.1