Part of the problem is that the wife puts on her make-up in front of the computer. When I opened up the case last year to replace the fan, it was full of that mineral stuff that she uses for makeup. And dog hair, and cat hair, and dust, etc.
Hubby throws a fit everytime he opens ours too. Cat, dog hair, dust, sand dust. I did stop folding laundry in the office because of all the fiber dust that comes off your clothing.