My new M Frame showed up today thanks to @OakleyBoss84 and while cleaning the lens I noticed something that I haven't seen on any other pair I've owned. While wiping a cloth moistened with cleaning solution over the front (outside) of the lens, the cloth glides freely and easily, just like every other pair of Oakleys I've owned. When I move to the back (inside) of the lens however, the cloth suddenly drags as if there is some kind of film or something present. It happens with both the grey and the clear lens, and only 1 of them has been treated with the anti-fog coating. Is there a known reason for this? It is something physically coating the lens, something special about the lens itself, or just something random to my pair? If the experts could chime in here I'd appreciate it, this is exactly the type of thing that drives me nuts until I understand what is causing it.