I've had this MacBook (white) for about 3 weeks now, and I love it. However, I was walking into my room, I noticed something ... Depending on the angle, my MacBook palmrest looks incredibly discolored! Head on I can't see it, so I assume it is oil from my hands. I rub at it with a moist cloth, but to no avail. I assume the oil is in the plastic. My question is, what sort of cleaning solution would you provide to remove this cosmetic damage?