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Woops, I just noticed you are in Sweden. So my advice for Home Depo, Harbor Freight, or Brasso might not apply. I'm sure you should be able to find similar things where you live.

I think you have a shot at getting the blackness out of the pitting. The black pitting near the pivot appears what is referred to as "Devil's spit." It can be hard to get out.

I find that using a...