I've had my macbook since September. Before I use it, I always wash my hands with soap, and I never eat near it. I have never noticed any track pad staining. I let my brother use the other night for a few hours. He didn't wash his hands, and I came down once and he was eating a pancake over it (and possible other stuff). After he finished I inspected the computer and noticed that the track pad is stained yellow. Is it possible to have stained it from only a few hours of use? Or is it more likely that it was always stained and I never looked close enough. It's a really noticeable yellow, I see it even when I'm staring at the screen, and I really didn't think it was there before, but might I be wrong? Thanks.