The best tip to remove smudges and stains from a PC monitor or an HDTV: Never ever scratch it with your fingers nails for a start.
Your computer monitor or HDTV panel will eventually accumulate a collection of annoying smudges and stains. If you take a quick survey of LCD or HDTV manufacturers about the recommended method for cleaning the surface of your monitor or TV screen, you’ll discover more don’ts than dos, often in conflict with one another.
First, attempt to clean your screen with a dry, lint–free cloth.
If you can’t find the cleaning cloth that came with your screen in question, then it’s likely you have one laying around from a laptop, iPad, or iPhone.
If a dry cloth doesn’t remove the smudges and stains on your screen, then get yourself two cloths and a solution of diluted dish soap and warm water.
After removing any dust from your screen with a dry cloth, dip the other cloth in your dish soap solution, wring it out, and gently wipe your display.
Next, rinse out your soapy cloth, wring it out again, and wipe your display to remove any soap residue. Finally, take your dry cloth and wipe the display to remove any streaking.