Have a look at this post in another forum. There are loads of suggestions! http://www.xsorbit1.com/users/dennx/index.cgi?board=ipodservice&action=display&num=1035865379
I used Pledge Lemon Cleaner on my screen worked GREAT. I use this on my honda shadow 1800 motorcycle windshield. good stuff
right on hope it works for you after i used it i bought some video ipod screen protectors by madcatz covers the whole thing but the click wheel good stuff