I just got a new MBP 15". The only wear on my 3 year old black macbook was the trackpad got really shiny. I've noticed that my new trackpad is already showing where my fingers have been touching it. While I assume at this point I can clean it, I'm wondering if there is something I can do to prevent permanent discoloration without affecting the performance of it. Or better yet, is the material of the MBP not subject to permanent discoloration?