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An oldie but a goody. I have some used copper pipe I wish to use for a new still head and a parrots beak and to clean & polish up the out side is easy enough the inside of the pipe is a different matter. This pipe has been only used in a domestic water system and should not have any real nasties in it, but would like to clean it up prior to and after fabrication.I have heard that vinegar is good... used Stainles Steel in my last still first time with copper.
Cheers Kina