yeah dude, that's the best advice. Just go to an Optical store (eyeware store) and ask them for a microfibre towel (the ones they give you to clean your glasses when you buy them.
i have couple one in my house and one that travels with me. The blackbook gets oily fingerprints and just using the towel will solve it. like Mitthraw.... 😛 said it it's getting too difficult to get out just dampen it with some water, SQUEEZE ALL OF IT before cleaning the computer and that'll do the trick 🙂