Do what you feel comfortable with. I've been using paper towels and windex for 3 years now. I spray it right on the screen and then buff it to a shine.
My method isn't for everyone, but I bought a machine, not some fine china. If this thing can't take some abuse, Apple really needs to stop charging so much. And believe me, it can take some abuse.
I treat my stuff right, but I'm going to use my things. I've bumped, banged, dropped, scratched, spilled, put stickers on it, smoke a pack a day in front of it, my battery hasn't worked in two and a half years, my screen flickers from time to time, my case is cracked, yellowed, my cpu whines, I've installed the os a dozen times and I hardly ever clean it except for the screen from time to time. Great machine. I'll never get rid of it. It's mine, it was cheap enough and I wanted to see what it could take.
Anyway...