I agree gunrunnerjohn that a certified shingle on the wall is not required to clean freight wheels or clean anything moving parts from cars or engines.
At the same time we both could mention that a Dremel tool and a bench grinder would be required for both suggestions.
I was just giving credit due to my good friend for my suggestion about use of the brass wire wheel.
I guess I need to add gunrunner that I am not certified in any product which is mentioned in this thread. Nor certified in Lionel nor MTH nor do I represent any business or manufacturer.
In fact, let’s just forget everything that I mentioned about any suggestions about how to clean truck wheels, metal or plastic.