Toothpaste will work fine on a new mask. Clean it twice with the toothpaste. Then use defog each time you dive.
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Apperently the lens are pre-coated with some process that retards fogging. Toothpaste has abrasive qualities which removes such coatings. I am however speaking about glass lens and not the cheaper plastic varieties...
I have 3 Aqualung Micromask that I use for pool training and skin dive at the seaside. I am very happy about it, since I have a "slim" face usually I have trouble to find a mask that fit well.Just got a new Aqualung Micromask, and I'm wondering if good old-fashioned toothpaste is the best way to do an initial cleaning to fight fogging. Once upon a time, toothpaste was the norm for ANY new mask, but I think times have changed.
I used one of the scrub cleaners which did some good, however the best results came after using just non gel "white" toothpaste. The mask did not fog after about 5-8 scrubings.