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The issue with residual flux, IMO, is that it absorbs moisture out of the air. Just look at a joint that's sat after brazing w/ flux. Over time the flux will change, it softens and changes from the glassy nature it has after brazing.
It's my feeling that residual flux can speed up any rusting that might otherwise happen, so I like to remove it as best possible or seal it in so no additional moisture can reach it. Andy
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AndrewRStewart