Red Wing recommends either mink oil or their boot oil for the amber harness leather on their website. I use the boot oil. I have a couple of RW shops near my home, and I'll just run over and have them replace the laces and oil them for me while I way - no charge. I do that Spring and Fall. Nearly 3 years in, and the boot leather is very soft and pliable, and my are feet nice and dry.
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