Plan on starting next week on a square tubing/pipe cleaner.
It will have 8- 8" wire wheels and 2- 1hp motors.
Feed the tubing through twice and it will be clean.
Later I plan on adding another unit, turned 90 degrees, so that it will be one past.
Pipe, you will slowly turn it as it feeds and will just be one past.
On items that I powder coat or paint, I spend 2-3 time the labor cleaning the metal, as I do welding the item up.