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I just use the screen wipe that came with the machine. It really does the job well I never wet it and any fingerprints, oils, etc, come off. Just make sure you wash the wipe every so often and you should be good.
 
I use Monster Screen Clean (I think that's the name, definitely Monster is the brand) as sold by Apple.

I started using this with my matte Mac's but now also the glossy, which I presume are less fussy anyway. I also use it on all my LCD tv's, picture frames etc.

Works brilliantly, no smears. Looks pretty smeary when you start but suddenly evaporates, leaving everything clean and lovely.

I love that Monster stuff! I use it on all my tv's and monitors.
 
Monster cleaner

I have tried a few of these products because dirt and fingerprints on my screen drives me nuts! I first tried iKlear but I wasn't a fan.. bit overpriced I thought and It didn't really do what it said it would.

I have used the Monster screen cleaner too... I liked the product. it seemed to really cut through any old residue that water and other products didn't. Plus I didn't find it to be harsh either, I reccomend! Hope this helps.
:)
 
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