What could one use to clean a focusing screen (Nikon D)? On a camera sensor they tell you to use air. Could I use a can of air, or should I just get a little air pump device thing? I know Best Buy has a cleaning kit with an air pump brush thing, but I'm not going to use that unless someone says it's fine. There is a bit of dust on the screen (including a tiny little eyelash-sized hair or fiber. Any suggestions? I'd like to use something either from around the house or that I could get at an electronics or Ritz camera store (my area has no good camera dealers.)