I'm a big fan of KlearScreen

A friend asked me:

Do either of you know the best way to clean my laptop screen?

I told her:

I use the cleaner and cloths from KlearScreen.

http://klearscreen.com

The screen cleaner comes in single-use packets or bottles and separate cloths. I mostly use the bottled version. I've been using the one bottle I've bought for 5 years now. If you clean the screen weekly, it stays really nice.

You can do a search for KlearScreen and find mail-order places that sell it. The company also sells it directly, but I don't know whether its more expensive that way.