Go to a sporting goods store that sell ski eqipment...
Ask for a product called: " CAT CRAP"
Once you get done LYAO, pick yourself up off the floor and buy it. It' s cheap.
Follow the directions and violla...fog free glasses.
This stuff was developed to keep ski goggles from fogging up.
Works great on scopes and bino' s too.

My only other suggestion would be the product made by " Rain-X" called " Fog-X" .