I've been having this white spot on my mid-2007 MacBook Pro's palmrest for about a year, and I cannot figure out what it is or how to get it off. I usually clean my MBP with a Mr. Clean magic eraser (which works wonderfully, by the way), but that or nothing else will get this white spot off. This makes me think that I touched my computer with some sort of chemical on my hand that reacted with the aluminum and discolored it. Does anyone know what could do this and if there is any way to get it off? There's no way I'm the only person this has happened to. Thanks.