Anyone who is concerned about bacterial build up in masks they wear more than once can pop it into the microwave for a minute. That will kill everything on the mask. Same concept as microwaving your smelly kitchen dish sponge. I've done it with a dish sponge. Goes from unbearably gross to no smell in one minute from the microwave. I don't know how microwaving a nice N95 mask might effect it's usefulness, but every cheap mask and bandana should be no issue.
Can we stop with the bad arguments about touching masks ruining them? If the point of the mask is to reduce the spray from ones breath or a cough or sneeze or whatever, it doesn't matter if you touch it and it gets "dirty," it's still reducing the output. You could wipe dog poop on your mask and it'd still reduce how much of your cough gets out.



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