Dust Busters are your friend. I just vacuumed up around my desk, which had a ton of cat hair, cheerios, and some chips on the floor (I know, I'm a fucking slob, but it's hard as hell to pick stuff up with my chair pushed into a corner like this) and now it's amazingly clean.
Also I can't get my copy of DMC4 to work, it seemed to install fine but when I hit the suggested running method I got a black screen. Now I deleted it and I'm trying to figure out how to get it to run...