I recently just noticed this issue towards the bottom on of my screen, that when I use the pen to draw it feels rough and you can even hear the pen going over the glass. It's just the bottom part and everywhere else on the screen it's very smooth and quiet. I noticed the issue when I breathe on the screen or using a damp cloth there are some streaks that show up, looks like a baby wiped snot on the screen and it dried up. However, I can't seem to get it off by using the Dust Off Screen Wipe or just hot water on a lintfree screen cleaning cloth. I'm afraid to use anything more abrasive due to the oleophobic coating. Can anyone recommend something to thoroughly clean the screen? Or is my oleophobic layer been "chipped off"? When I turn off the screen and try to look for it, it is not visible at all, just when I breathe on it or if it has some wetness to the screen. I don't want to exchange it out for another surface since I have no other issues with this one.