Q. What's the best way to clean a TFT screen?
A. The simplest and cheapest way to clean a TFT screen is with a slightly damp cloth, wipe off the left behind water with a towel or similar then smooth/dry completely with a yellow polishing/dusting cloth. Be careful not to use products such as toilet paper and kitchen roll as they contain lint and can leave scratches on your beloved screen! Cleaning solution from opticians and lint free clothes for lens cleaning are also very good.
For the perfectionist, there is "Lindy" brand TFT cleaner. It costs about £4 for a pump-dispenser. You can pick it up at office supply stores and computer fairs.
Also XTREMEPENGUIN added this in one thread: "I bought some TFT cleaner from a well known internet store named after a rainforest. the stuff is called "Klear Screen 2oz LCD Screen Cleaner Starter Kit." You polish the screen with it and it comes out just like it was new. The finish feels really smooth like ice and it helps prevent dust settling on it again. You get about 3000 uses in the spray bottle and some good lint free cloths to use. I highly recommend it!"