Your old flat screen doesn't even have to be that old to have missed the smart TV wave: The first modern smart TVs only came out in 2007 (via Smarter Home Guide).

If your TV is showing unsightly fingerprints, marks, or smudges, you’ll need to know how to clean a TV screen safely. This is especially true if you have young children or energetic pets running ...

Q: How do I remove fingerprints, including old ones, from a flat-screen TV? A: Back when the only screens in most homes were televisions that showed images projected from the back via cathode-ray ...