Unfortunately heat that dries the mask will
decrease efficacy. Ethylene Oxide is used by hospitals to sterilize equipment and now masks.
UVC sterilization can also work on masks and maintain their efficacy.
Repelling liquid droplets is an essential function of a mask, surgical masks have a water repellent that is not as effective after exposure to soap and water.
The most important function of a mask is to prevent airborne particles entering your nose and mouth. If you touch the mask, you are at risk. With every touch of the mask you need to cleanse your hands before you touch something else. I spend much of my day coaching my staff not to touch the mask. A well fitting nose piece is most important, if it slips, we all move it upwards.