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All I can say is don't eat around your computer, and if your hands are dirty/oily/covered in food then wash them before you use it. My original unibody still looks pretty much new after 38 months of intense daily usage - I'm not obsessive about mine but I do take care of it; I really don't know how people manage to get their computers so dirty!
Wow, really? None of the oily spots? I mean, I always wash my hands before using my computer. Should I just not buy a keyboard cover maybe?