I have a number of things on the self for this kind of thing, but try Mequires Ultimate Compound, followed by the Ultimate Polish......plus lots of elbow grease....
If those aren't working there's the fine cut and medium cut cleaners. Wrap up with the polish and go to sealant.
(IMHO, I would never use metal polish on paint)
Finish with a high end sealant...... polymer or ceramic...
Oh yeah, good quality microfiber towels for this job are a must, no terry cloth or other raggy materials.
