Just bought the 2010 21.5" like 10 hours ago. Love it so far. Was debating for weeks the new Macbook Pro but decided on this in the end. Out of the box there was a little bar code sticker right on top of the base stand beneath the screen. Peeled it off but it left that annoying sticker residue on the base. How can I remove it without scratching the aluminum, it's really on there.