See, that's sorta why I'm fearful of buying a white laptop. Not for the little things, but because I'm sure by big greasy hands will stain the palm rest
I sold my 1st gen (white) MacBook earlier this year and the thing still looked like the day I got it. And I drug that thing with me to Iraq for a year.
I take very good care of all of my computing equipment. All my laptops get a Zeroshock case and a screen/keyboard protector for when I close the lid.
try one of those magic erasers.. i was smoking actually a few months back and dropped the "cherry" or whatever you'd like to call it, directly to the left of my trackpad.. had almost a yellowish tint to it the size or a dime almost.. now you cant even tell that there was anything there.