For what it is worth, I don't. Once I have a knot I am happy with, I've given up retying routinely unless the leader is frayed. A well set knot (I use a vise and two hands to set mine) in heavy mono or fluro is not weakening anytime quickly....and I have more confidence in a knot that has been tested and passed, than a new one tied in less than ideal conditions. Occasionally it costs me, but no more than new knots have.
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