If I am correct you can use jewelry buffing compound.. And it is commonly used... I used the red compound that was in the kit... then decided that I got better results with just the wheel... So compounds that are used on silver or brass should be fine .
I have ssen friend very recently using Plastx from checker auto!! With awesome results
Get non-silicone compound with no other solvents if you go with car polish
Remember when wet sanding to go back and forth not wax on wax off