Unless you’re the proud parent of a little Picasso who decided to make his next masterpiece on your flat-screen, the build-up on your TV might be subtle enough that you’re inclined to disregard it entirely. I mean, you only really notice when the TV is turned off and the light is at a certain angle—so what’s the big deal, right? Wrong. According to the cleaning pros at American Cleaning Institute (ACI), even just a thin layer of dust and a few smudges can make a screen dirty enough to cause eye strain. As such, ACI recommends cleaning your TV screen on the regular (read: a few times a week). So, yeah, chances are your TV screen is long overdue for a wipe down. Read on for everything you need to know about how to clean a TV screen the right way before you get started, though, lest you damage this costly piece of equipment.