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Viewing marine life and underwater scenery can be difficult if your snorkel mask fogs up. Fortunately, there are a couple of easy tricks to avoid this problem.
If using a new mask, clean it out beforehand with a little toothpaste to remove any protective film. Gently rub non-gritty toothpaste on the inside of the mask and let it sit for a minute before rinsing it out thoroughly.
Before entering the water, there are two options that will help keep your snorkel mask clear. Your first option is to squirt some store bought defogger into the mask, rub it around, rinse, and you are ready to go. The second option is to use your own spit. This may sound a little unappealing, but it works just as well as the store bought defogger and it's cheaper.
If the mask starts fogging up while snorkeling, let a little water leak into your mask and rinse over the lens, this should clear it up. If that doesn't work, take off your mask and let the spit fly.