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You want to get it REALLY clean? Place it in a ceramic basin filled with lye, and boil the lye. You can do this over fire, but better is to take a positive and negative power cable (like from a car) and drop them in the basin at opposite ends, and remove them after it boils for 15 minutes.
When you remove the pipe it will be so clean you'll think it's new.
I've used this technique on forged iron with 200 years of rust accumulation. It fucking works.
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