Your way woks well, Bandit..
I would ask you (or anyone) to just try using the Thin Cut-off wheel approach just once.. Held at a low angle..it acts just like a "Powered Putty-Knife" and leaves the Plow Steel with a Polished finish.. It takes the Rust OFF, right down to the Black Oxide surface ON the Steel, and that will scour right off.. I don't think anyone has used this Method and believe ME, it is better and Faster than wire brushes (probably Safer) and will not leave any damage in the Steel.. 4 1/2" angle-grinder with THIN Cut-off disc..
Just trying to help.. Ron..