This is something I do weekly as a ritual for the last 40+ years,,...I screw off my stage mic screen heads remove the foam insert and put the screens into boiling water to remove the crud, bacteria, dirt, etc,...take it out and use a small brush on it in case there's anything in between the screen, Then take it to the sink and use the high speed spray inside running it thru the screen.......as for the foam inserts I just lightly run under tap water to remove any dirt.
Dry everything off with a paper towel and your done for another week of singing!!