Q: How to clean screen?

I normally use windex and a rag and it has been great!

Don't use window cleaner, it is to harsh for your screen.  Use a mild soap on a damp micro fiber cloth, take a look at this link,http://support.apple.com/kb/HT3226

I use a bottle (pump spray) of eye glass cleaner bought at the dollar store. I figure if it's safe for a coated plastic eye glass lens, it's safe for a coated glass computer screen. I spray it on a paper towel and wipe the screen.  Works for me.