Below is a steel inner wheel from a 1995 F350 dually. Hasn't been cleaned in 25 years.
First step was cleaned with Sonax Full Effect. After rinsing was cleaned with Iron X to remove the remainder of deposits. Below is a pic the Iron X doing it's work after Sonax Full Effect was rinsed off.
Final result.
While the process worked it required a lot of elbow grease and time. Is there a better set of products to use? I would not be comfortable with the amount of scrubbing I had to do if this wheel was chrome or aluminum.

First step was cleaned with Sonax Full Effect. After rinsing was cleaned with Iron X to remove the remainder of deposits. Below is a pic the Iron X doing it's work after Sonax Full Effect was rinsed off.

Final result.

While the process worked it required a lot of elbow grease and time. Is there a better set of products to use? I would not be comfortable with the amount of scrubbing I had to do if this wheel was chrome or aluminum.