I wouldn't use a paper towel. Buy a microfiber cloth and use filtered water to avoid any residue. If you are in a real bind a soft white t-shirt (hanes, FOL, etc) would suffice.
There's some stuff called screen kleen that is also very nice. It used to be OK for RP Tv's, I would double check the site to make sure though. It worked very well on my DLP.
http://www.screenkleen.com/