Sorry if this is a repost but I could not find any pictures so maybe this will help somone out.
I read about drilling mirror drain holes but could not find any pictures, so today after washing my JK I could see the problem people talk about where the water just oozes out for a while at the bottom of the mirror.
First I removed the mirror, Torx T40
You can see in the second picture where the gasket has a void to allow the water to drain, I drilled my hole in the same spot.
The hole I drilled is 1/8" if I have problems with it draining I can always make it bigger.