Use a feather duster, or one those Swiffer dusters. Just a quick once-over every few days and the screen should stay nice and clean.
If you must use a cleaner, make sure it's free of ammonia. Don't spray directly on the screen, but instead on a soft cloth, and then wipe. Some say combinations of water/alcohol are good...you can see some suggestions online.
These tips came from someone who works for Runco.