divinh
Contributor
First mask I had, I used the toothpaste method but I don't think I actually got enough of the manufacturing film off the lenses, so it would occasionally fog. The second mask was flamed by an instructor. He held a lighter flame at the center of each of the lenses and you can see the film burn off and leave a black residue. After some rinsing, it was clean and never fogged. He was about to do the same to my friend's mask when he noticed that my friend's mask's lenses were plastic! He said the mask was probably only for snorkeling.
I guess the key lesson is to make sure the lenses are glass, which does have the film residue as part of the manufacturing process. Plastic probably doesn't.
I guess the key lesson is to make sure the lenses are glass, which does have the film residue as part of the manufacturing process. Plastic probably doesn't.