Hello Guys,
I have a mask from a different manufacturer (Atomic) that had a similar problem.
I finally used a product I got at my LDS (Diver's Supply) called "500 PSI Mask Scrub". 500 PSI also makes one of the best de-fogging gels on the market. Toothpaste, while cheap, is clearly less effective than this stuff.
But, even with this product that is made specifically for cleaning mask glass, I still had to scrub the mask thoroughly several times to get it completely clean. After the first application, I tested it and could see where I had cleaned (no fog) and where I hadn't. You really need to bear down on it as if you were polishing something. Just wiping it on and off won't do it.
After I finally got it clean, it has been fog-free when using the de-fog gel.
If you can find 500 PSI Mask Scrub, it is not expensive and did the trick for me. BTW, it looks like white chalky toothpaste, and I could feel a fine abrasive in it.
Good luck solving your problem and kudos to the Oceanic Guys for being so responsive to this (and other) problems.
Thomjinx