Hi Phil
I have a 5 and a half foot x five foot high tank that I use and then use my welder for the power supply with 2 quarts of soda from Home depot
and I can remove rust, paint , and what ever else is there in a few hours.
Just make sure the connections are right or your steel ages and disappears into rust. For cleaning the roofs on the cabs I just lay down a plastic sheet , set up some blocks around it and fill with water ( like a mini pool) and Soda and the welder and it cleans them up real quick
All you need to do is hose the parts down and brush them off
It has worked for me for a lot of years
Stew
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