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Actually, on this one I just let the blade soak. Usually when I get an old razor, the scales are in far better shape than the blade and easier to polish up. I can't see how mineral oil could harm...

No. Not that. Get your minds out of the gutter.

Always on the lookout for newer and quicker ways to clean old razors without resorting to sanding, I left a moderately tarnished razor to soak in...