I've had my MBP since Nov 2010 and its lived in a speck case the whole time. I clean it every month to get any junk that might slip in and I recently noticed that my case is pitting on the edges by the front and the bottom of the case. I know the pitting is supposed to happen due to the oils and ph of the skin so how's it possible to be happening in areas where no skin touches it at all? The top case were the hands rest have no pitting and food doesn't get stuck on the bottom of the case either. Thoughts?