Cleaning the inside of copper tubing.
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Previously:
https://www.homemadetools.net/forum/...231#post230683
https://www.homemadetools.net/forum/...371#post166009
https://www.homemadetools.net/forum/...144#post211069
https://www.homemadetools.net/forum/...198#post149888
https://www.homemadetools.net/forum/...181#post214586
