what's the best way to physically clean a macbook/ibook? i'm pretty strict on keeping my hardware clean....but the outside plastic gets fingermarks too easily. oh another thing. i remember w/ my old grey dell laptop, i had this dark palm mark on the sides of the trackpad after awhile. already, i noticed a slight dark blur w/ my macbook from looking at it at an angle. is there some kind of cleaning product that takes it away? water and a towel don't help that much.