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That goes for any of the "real" ways to prep a mask for use; only do it to glass! Some "claim" a lighter will do the trick even easier (no rubbing). Soft scrub with a scrubby pad suitable for teflon is the best IMHO; "white" toothpaste with that same scrubby pad is pretty darn good. I have had masks that had a permanent white rim at edge of glass and didn't notice any burning?
Now I use a local plant for shore diving and diluted baby shampoo on boats (cause that's what's there).
If you really don't want it to fog anymore, wash it with Dawn, dry it out, burn it with a lighter, burn it good until black soot is over the entire inner surface. Wash it good with hot water and Dawn.
The silicone skirt is molded at fairly high temps, the lighter will not harm it until and unless you get the glass glowing red, that is a bit too hot.
The "film" that is on the glass is just left over, for lack of a better word, dirt, grunge, silicone, and know telling what else. The flame burns it off.
I've tried soft scrub and tooth paste on my mask and the only thing that worked was the 500psi mask scrub...after that I just use baby shampoo $1 and I have no fogging problems. Maybe it had to do with the low volume and clear lenses, but It was a pain having 90ft viz and your mask fogged up.