Real men don't need a mirror to shave
The real trick to keeping fog out and off the mirror is air exchange. Turn on the fan, or open the window, or even shower with the door open.
This one only works for straight razor shavers:
While shaving, wipe the lather off the razor onto a length of tissue paper (I use toilet paper). After the shave, roll the paper up into a sort of sausage with the lather inside.
Leave that to dry until the next shave and use the sausage to wipe the fog off the mirror. The paper dries the mirror and is impregnated with soap. Which prevents new fog from forming.
Greetings
oskar
shampoo also works a treatI'm sure someone elsewhere mentioned this but the secret is . . . washing up liquid. One small amount, applied to a cloth and wiped over the mirror every 2-3 days seems to do the trick for me.
I don't use any treatment on the mirror. I just turn on the fart fan when I'm in the shower. It's there for the very purpose of preventing excess humidity from building up.