I was cleaning my 15" MBP Retina today using a cloth that came with one of my other iProducts and noticed that some of the coating on the black outer border was coming off. At first it looked like smudges until I went back over it and noticed it was coming off and getting larger. Anyone hear of or had this issue? Possible concern for a bigger issue? I couldn't find much on the forum other then the dead pixel issue which I had previously that Apple replaced and a yellowish tint which I'm dealing with right now on the left side of my screen which Apple says it's not noticeable.