Someone posted about using mineral oil on them last year. Since I had a five gallon bucket of it that's 3/4 full sitting in my garage, I tried it out when de-winerizing a few weeks ago. Did a really great job of taking off the black marks on slide sides. Lubricates them and the seals as well. Think I paid about $30 for the bucket at a tack store - it's used on horses. I use it for woodturning wet wood, but got the big bucket since it was cheaper than a one gallon. At least now I've another use for it.
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