I noticed my signal balls looking funky, darker or like there was a smudge on them. Noticed this more and more the past few weeks. Decided to take a closer look and sure enough, there is a bunch of dust in the top left of my screen. Right next to mute switch. Never was like that before. For day to day use, it's not really noticeable unless it's a white screen and I remember it. For the most part its not bad but not really acceptable from a device like this. Not going to swap it as I believe it will still happen? Anyone else have this issue? Anyway to clean it? I did compressed air which seems to have helped a little. My screen came up off the frame which was cool. lol.