Dear friend, I hope I am not too late... PLEASE DO NOT USE ANY ABRASIVE NOR STRONG CHEMICAL AT ALL in the D Mask! I only used a mild dish detergent and my fingers to stop the mask from fogging and I ended up stripping the UV coating on one of the lenses. I didn't use any force at all but I did rubbed each crystals perhaps 1mn too long... It's a true pity because this is the BEST mask I've ever used and especially having a full size beard. On the positive side, SCUBAPRO in Germany sent to me a pair of replacement lenses without further questions. I guess they are aware of the issue and they also have a fantastic After Sales Customer Care department (at least here). IMO, the UV coating should be placed on the outside and we simply should be slightly more careful with handling. On the negative side, there's nothing one can do to stop this mask from fogging but leaving some mm of water inside and rinse it often with circular motions while looking down... meaning eye irritation is unavoidable. Perhaps rubbing less time with the detergent could have solved the issue with time... don't know. Closing, I started using prescription 'reading' glasses so I ordered the clear versions from Scubapro that obviously fit the D Mask. These don't come with any UV coating so the problem is solved. The bad thing is they only come in +1, +2 and +3 increments. I need +1.5 so I've got +1 hopping that the additional +.5 will be covered by the +25% water magnification. Mind that extra magnification if you plan to order them
Tried to respond on my phone and it didn't work, so here is the edit.
I have not (as of yet) taken off the UV coating (it sounds like it IS on the inside as well as outside based on what you are saying). I have just used dawn and my fingers / soaking several times... hard to tell if it will work ok.