scuff marks..
I suspect thats what they'll say. It's got some cracked plastic also on the case which should be covered so I'll ask them.
I don't think that the marks will clean off - I've tried a microfibre cloth and wouldn't want to use anything abrasive.
I've also got a 5 yr old power book, and the screen is as pristine as when it was new - I guess it's due to the design.
thanks for the advice though.