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If you grew up with a CRT TV, you might recall how well it attracted dust. You may have even been handed some Windex and instructed to clean the screen.
Do not do this with your LCD TV! Many ordinary glass cleaners contain ammonia and will either permanently discolor the display or leave a film behind.
Instead, dampen a lint-free or microfiber cloth (like the ones that come with eyeglasses) and then wipe the screen clean. Don't use paper towels, which can leave fibers behind, and don't spray anything right at the screen -- just dampen the cloth.
The good news is that LCD TVs do not collect as much static as CRT sets, and may not need to be dusted as frequently.