How to clean the iBook G4

Hey all,
I'm the proud owner of an iBook G4 933. I love EVERYTHING about this machine except for one thing: the dark spots on my palm rests.

I'm a clean person, but I still find that even after excessive hand-washing, I get these dark spots. I have used clorox cleaner and a few other things to try and clean it; I've had no luck.

Does anyone know of a safe and effective way to clean the palm rests on the G4 series of iBooks?

Thanks,

Well, I've used the iKlear stuff, and scrubbed for along time, and got most of it off.