If you are wearing one of my masks, congratulations! This mask is made with polypropylene paper, and protects the wearer as well as the people around them! But for this added protection taking care of them is a little different than basic cloth masks.
1) Best is to steam, either sanitary steam cycle on the dryer, or 10 minutes steaming on the stove/ rice cooker/ instant pot
2) Bake in the oven 30 minutes at 160. Riskier because people have been known to turn up the heat and melt them not knowing that someone else in the house is sanitizing.
3) A gentle hand wash without a lot of agitation can be used, but it will lower the effectiveness of the polypropylene filtration sooner. That being said, 2 layers of washed polypropylene and one of fabric will still be better than 2 layers of fabric alone.
** There is metal in the nose! Do not microwave!! **