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Better to get the cheap stuff they import from China at the dollar store. You would not want to put it in your mouth but it's a great mild abrasive scrub for masks, baked on cheese in a lasagna dish, or stains on the counter. And at a buck a great deal.
Skip the toothpaste. Glass stove top cleaner. Atomic masks for some reson are hard to get clean. Our Atomic rep suggested stove top cleaner, I now use it on all masks and keep some aboard our boat for our divers to use.
If you parted with $100 or so for a quality mask as I did, why not add a couple of dollars for a tube of dedicated mask cleaner product? I realize the abrasive in it is the same as in toothpaste, but they sell the stuff at your local dive shop, and at least the one I bought for my Atomic mask seems to work just as well as I recall toothpaste working (minus the mask having minty-fresh breath). If I were cleaning a mask every day, I'd go for toothpaste as a more economical option, but this is my new favorite mask.
. . .
I thought that you were supposed to use toothpaste for the initial cleaning to remove the film from the factory and from there on, mask cleaner was good?
Or, you could just use a lighter to burn the film away.
Just give it 2-3 seconds to avoid cracking the lens, and repeat a couple of times when the lens has distributed the heat evenly/cooled down.
Rinse the soot away, and you have a nice lens that does not fog.
Oh, and use the yellow Johnsons baby-shampoo as defogger, not the pink...
With what mother nature gave me to use as defogger, I can probably count on two hands, the number of times in 20 years my mask has given me fogging problem.