This what i use when the wheels are really dirty.
Other than that 409 does the job

http://www.pssales.com/products/wheel.html

BRAKE BUSTER

#N26 - Brake Buster, a non-acid wheel cleaner, safely removes accumulated brake dust and light corrosion from premium quality wheels without damaging the delicate surface. Brake Buster is a unique cleaning gel that adheres to the wheel surface and penetrates the brake dust allowing it to be rinsed away. Brake Buster has been specifically formulated to clean like acid products but without the risk or the acid. Use Brake Buster for all wheel cleaning applications.

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