The best stuff that I found was the Mothers Aluminum and Mag Polish.
Now here's one of the best tip's that I know about polishing Aluminum. After you rub the polish on the Aluminum for a while it will turn black, this means that it's removing the oxidation and doing what its supposed to do. Now the black polish residue is like greese and does take some buffing to remove and shine it up!
Here's the trick!!!
When you are ready to buff the polish residue off the aluminum use a dry clean cloth and dip it in ordinary kitchen flour. Now buff the black polish off. You won't belive how much of a differance that this makes! Less buffing and a cleaner, brighter shine every time.