I use the Pledge Multi-Surface stuff on our electronics. I spray a cloth lightly, then wipe stuff down. IIRC, Endust also makes a spray for electronics, but I like the Pledge because it's a multitasker and less expensive, I think.
a microfiber cloth , a mix of 50/50 rubbing alcohol and water. (Plain water works too but not as well) or you can buy an LCD or monitor cleaner.
I myself wouldn't touch my TV or monitor with a dry cloth , the dust can scratch it , or leave fine marks in it .
Also clean it when it's off and cool.
if your able to tilt the tv slightly down, it will reduce the amount of dust that collects on the tv screen it self .