It is not uncommon to have heavy scratches on Apple Logo for iBook Clamshell. It is because its upper case is convex in shape and that logo is situated the "Uppermost" of the upper case.
Applying polish liquid to rub the apple logo is easy, for details, please watch this video:
Use Masking Tape to protect those area which do not need polishing. And then apply small amount of polish liquid on the Apple logo and rub by a piece of cloth.
Now, done! The Apple Logo has been made glossy. b(^ .^)b