How to keep goggles from fogging up
There's a few ways. Most quality new goggles come with a coating on the inside that prevents fogging, but that wears down. You can buy spray online to reapply that coating. Search it on amazon - there's tons of brands available, and most work about equally as well.
Spit will work, but that could give you pink eye.
Baby shampoo or hair conditioner will do the trick, as it will leave a thing film on the goggles that will act like a defogger.
I've heard lots of other tricks, but none of them are easier or more effective than the above, so those will be your best bets. Good luck!
Toothpaste. Put a dap on the inside of both lenses and smear it all the way. Then after a few seconds rinse off the toothpaste. Just be careful not to scratch the lenses. I do it all of the time.