I've used a ton of aluminum polish, and the best stuff BY FAR is a product called Nuvite.
I'm partial to the Nuvite "Nu-Image" for polished metal. It is used by Boeing on their aluminum, and it is amazing. I have a Formula 5000 car that I race locally, and it has an aluminum tub, aluminum fuel pods, and an aluminum wing, that I polish constantly. the Nu-Image is the easiest, and produces an outstanding shine.
Here's the link, and look at the bottom of the page.
Nuvite
Enjoy.