I like Krud Kutter or simple green used full strength, an automotive wheel brush works the charm. (think big bottle brush)
I like the acidic wheel cleaners too. Maguires brakedust cleaner is the bomb. pre wet the rim, scrub and rinse promptly. It will etch alum if left to dry.
To do is to be. Socrates
To be is to do. Plato
Do be do be do. Sinatra