Baby Shampoo Wash to prevent fogging of goggles
Take your Shampoo, lather up and apply to the inside lenses of your goggles. Rinse, then apply again, this time thinly. DO NOT RINSE, but wipe with a clean rag. Some of the shampoo (a thin film) must remain on the lens for this to work. Other versions of this technique go straight into the wiping of the lenses with a cloth that has been dabbed with a little water and shampoo. However, I find the wash method has a more even effect on the lenses (but that is just me). It will help prevent fogging of goggles for up to four or five hours, depending on the atmospheric conditions, how much you work up a sweat, etc.It is an off-shoot of a technique used by SCUBA divers to prevent fogging of their diving goggles. In the original technique I heard, they used toothpaste. However, some toothpaste have that minty flavoring that sort of stings the eyes when freshly applied. Hence, the switch to shampoo. Hope this helps! 
