Wd40, NOT. Rubbing compound is for extreme oxidation, too much, and you'll be down to the primer.
Polish is polish. Polish works on everything, except rubber. My phrase is,
Polish, polish, polish, wax, wax, wax.
Polish it 3 times, and wax it 3 times, and you'll be blown away.
btw wax is great for everything, except rubber, too.