I have a set of aluminum rims which are a pain in the ass to clean and maintain. I used to use Meguiar's wheel cleaners, which removed the dirt and dust but never made the rims shiny. I did some research online and bought Mother's Mag and Aluminum Polish. I have to say its an awesome product. I took a few hours to clean all 4 rims. In the end I used a can of clear coat to protect the rims and hopefully prevent oxidization.
Before:
After:
Right side is polished, left side is not.
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Inside rim:
Before:
After:
Right side is polished, left side is not.
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Inside rim: