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No matter how hot the water is (and 'science' says it can never exceed 212 F. at sea level where few of us live), on its own it will not remove copper or lead fouling. Or carbon deposits.
If you're scrubbing with patches then it is impossible to scrub too much; besides, as dirty as the OP's bore seems to be, he's not even gotten down to the metal yet. Scrub on.
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No matter how big and tough you are, when a two-year-old hands you a toy phone you'll answer it.
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