Got a pressure washer ?

Any of the heavy OTC acid wheel cleaners is fine. Just do it on a cool surface (cloudy day, early morning or late afternoon), very short dwell and pressure rinse it

I don't even use soap or a brush on the wheels no more. Pressure washer get's the job done and I follow up with a old mitt, as mechanical agitatio is still required to removed the ~road film~ that a pressure washer doesn't remove