Hi there! Seems to me this question has been addressed before,
and as usual, it probably wasn't under its own topic header...
I sold an older iBook white dualUSB and wondered about a good
polycarbonate cleaner and scratch remover; and maybe this one
(like several on the market) could be adequate for the purpose:
For damaged acrylic/polycarbonate and metal:
http://www.radtech.us/Products/Icecreme.aspx
For displays, and other surfaces:
http://www.radtech.us/Products/OmniCleanz.aspx
Some companies also sell a clear silicone protective layer that
stays directly over the display while in use; somewhere I have
the supplier's url bookmarked, but have not ordered any of these.
Places like OWC and any portable computer repairer's web site
may also have these kinds of products, too. Good luck! 🙂