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You should be able to clean only the problematic areas without touching the shank/spine.

You could re-blue it, but I don't think you can match the original. Much easier to polish/sand in a...

Most likely it didn't 'develop blue patina', this model has the shank blued at the factory and probably the blue is rubbing off as originally it is a rather electric type of blue.
I'll see if I can...

These are nice razors.

With goldwash you want to be gentle. The idea of it is that gold is non-reactive so it stays shiny. If it isn't it's just grime and the challenge is to remove it without...