I have had my white macbook for about a year and a half now. Just a couple of months ago, I started to notice that my macbook was aquiring a light blue tint on the bottom of the outside case. I am wondering if it has to do with the heat of the macbook on my blue target bought comforter (purchased just before the tint began appearing) where it usually sits. Has anyone had this same problem and can anyone give me some tips on how to remove this tint?