[stealthboy]

I'd say some sandpaper and some good ol' elbow grease. It worked for my cousin's skyline after we messed it up. Also, if its gunked on pretty thick, u might try some nail polish remover VERY CAREFULLY. Put some on a q-tip and wipe a small area, then dry it off. If you do use the polish be careful cuz it will fog up your plastic if its left on too long. Good luck.