Originally Posted by rich
Sober as a judge.
Anyone who used to ride a motorbike years ago, wearing mark 9 goggles instead of the visors that you have today, will know that a smear of potato liquid on the inside of the lenses kept them from steaming up.
I never tried it with turnips; we weren't exactly posh but we were able to afford potatoes and didn't have to survive on animal food.
Spit also works as well for the mask underwater, for those into watersports... so does the slime off of certain corals which saves you trying to spit at 30m with your mask off...