If you have an old fashioned TV with a glass screen or CRT monitor, a paper towel or glass cleaner works great for cleaning up dust or fingerprints. Turn the TV off and let it cool off. then spray the cleaner on the towel first. Gently wipe the screen. For cleaning lap top screens and flat panel monitors, put glass cleaner away-- ammonia based cleaners can damage the screen. Instead use a soft cloth dampened with water. If it doesn't get the gunk off, use a solution of 50/50 water and vinegar. Let the surface dry completely before turning it back on.