Best low cost approach for restoring aluminum trim?

[msg]

I found a panel and took a few pics of how it last turned out. Ill also need to check with the PPG store on what I need to do to prep each spot that needs black paint. I did avoid wetsanding those before and only polished, but I bet they need to be scuffed for the paint to take properly. Always something. Or I might just go without the paint, maybe paint them later when it bugs me enough.