I have this stuff called IKlear from the Apple Store but I'm wondering if I should even use it. On my old MBP, I was always suspicious of this permenant little discoloration or blemish. I always wondered if it came from the IKlear stuff - which said it was good for MacBook's but not MBP's. So, what should I do? I got a cloth that came with the IKlear and I got this SMUDGE of a fingerprint on my screen that is semi-annoying me. Suggestions?