So i've had the MBA for over a month now and it's perfect for what i need. But there seems to be some grime/dirt that forms at the bottom part of the top portion of the screen bezel, i'm not sure where it picks up the dirt from, and my guess is that any dust or w/e that lands near the bottom gets picked up via contact to the bezel. I can wipe a good deal of it off with my finger but some of it seems deeply engrained and i don't know how to clean it or prevent it from getting worse. I spoke with a friend who has a MBP and he said he has a similar issue, but honestly I took a look at his laptop and didn't notice it to be as visible or apparent as it is with my air. Any ideas on how to clean it or prevent it from getting worse?