Originally Posted by Shraykin
You can use dishwasher soap. It usually works for me
Dish soap works as a temp fix, but it can irritate your eyes after prolonged use.
You can get Sea Drops (anti-fog drops) from most dive shops for around $6, it works great, and is made for Dive Masks, Ballistic Goggles, Scopes, etc. If you go the anti-fog drop route, it is not a "day of" kind of thing, you should follow the directions on the bottle and apply the drops beforehand, let dry and buff. (you can apply drops on the day of, for a quick fix if they start fogging, or if someone else needs drops)