Back in the late 60s I was a FAA radar controller at Edwards AFB during the world record sr71 flight from England to Los Angeles. That plane flew over Edwards to LA at its record speed. At the same time I had another sr71 up locally who had just completed a high speed run and was descending to land at Edwards. The landing sr72 was slowing down and was much faster than the record sr71 who was overhead at the time. The true speed of that bird was classified and enormous.
I read somewhere that washing the mask in Rubbing Alcohol kills the virus and the mask dries quickly. I forget the percentage of alcohol it needs to be.