I've used the Clearkote metal polish and thought it was pretty good stuff. It worked well on my uncoated polished aluminum and brass, gave a nice shine without much effort.
I recently ordered the Adam's polishes metal polish, a 2 part polish and was impressed with the results. Gave really nice results on my aluminum and brass, better than the Clearkote polish I thought. A little pricey at 19.95 for the pair but worth it.