I noticed a while ago that there is dust or some other form of debris in the speaker covers of my rMBP. It's worse on the left side than it is on the right. Here is a picture of what I'm referring to: (click to enlarge) The picture above shows something in the top right hand corner of the speaker cover, in a perfect rectangular shape. Is there an easy way to remove what's blocking the holes? I tried using something sticky to pull whatever is in there out, but that didn't seem to work.