I have had good luck with Kriol. I wipe down the barrels and wood and have seen zero signs of ill effects. I also use Renaissance wax on all metal and wood twice a year. The wax will clean clean off light dirt and oxidation and it leaves a real nice protective layer that repels moisture and finger prints. But please note I live in one of the driest climates in the U.S. (Nevada) humidity is not really a factor here.
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