Baby Shampoo (tear free stuff like Johnson's)
Mix a solution of water and shampoo. I recommend anywhere from 5:1 to 10:1 (water : shampoo) in the spray bottle. You can experiment with different strenghts of the solution for best results. Spray the solution on you goggles or eyeglasses and wipe off any excess. I provide no guarantee of success. Success is up to you. This no-fog spray is used by SCUBA divers around the world, but even under extreme conditions (high heat and humidity) even this will fail. So don't count on it as being a fix-all solution because there is none when it comes to keeping goggles fog-free. Except using a combination, fan, spray, and thermal lenses. Even then you still run into the occasional foggy lense.
"It is white."
- George W. Bush, when asked what the White house was like by a student in East London
"SAFETY FIRST: Please put on your seat belt - prepare for accident."
- Sign on backseat of Taxi
If there is a possibility of several things going wrong, the one that will cause the most damage will be the one to go wrong.
If there is a worse time for something to go wrong, it will happen then...