Drano and others here. When I get to a store or anywhere where people gather I put my mask (N-95) on in the car as I get out to go into a store. I take it off back in my car and when I get home, I put the mask in direct sunlight. All you need is about 20 minutes or less and any bacteria or other particles will die in that time span and it's ready for another use if one uses an N-95 more than once as they are expensive. Hope that helps as a clinician and a lab statistician both told me this information