DerekR
Contributor
Be very careful using cerium oxide on a mask. It will micro-scratch the glass. Too much and you will have a harder time keeping the fog off.
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I guess I need to work harder on company name recognition. As an FYI, our masks (and other gear) is sourced from the exact same factories that are utilized by the larger brands who sell their products through typical retail stores.
Our masks are excellent quality, the price is lower because we sell direct. And YES we do recommend the "flame technique" for our masks.
you guys seem to confuse dirt/cleaning with fogging. Both impair vision, but it's two different things. A hydrophobic silicone oil residue film might even work as an anti-fog and prevent fogging rather than cause it.
Cleaning: white spirit dissolves silicone residue on glass, but apply very carefully. Dishwasher and flaming should be OK for the glass but may damage plastic parts of the mask.
My bathroom mirror is very clean but always fogs. This is just a matter of cold surface + humid air. After cleaning the mask, you still have to apply some anti-fog (spit, baby shampoo, ...) and cool your face before diving in cold water; warm water divers may not need it.