Hello Fernando, What I meant by a "rubbing" is not a cleaning method. It is when you take a piece of paper, place it over the section of blade that has the makers mark and then using a pencil held so the graphite is at about a 45 deg angle rub it back and forth on the paper gently to reveal the makers mark on the blade underneath. As I am not very good at explaining how this is done, I would recommend a quick Google search on how to make a rubbing.
Best,
Robert
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