As for cleaning the blade, if it were mine I would remove the verdigris from the blade so it does not spread any further. I would then take a piece of dry coarse cloth and use it to polish the blade and fittings removing only the dirt and any other built-up wax, oils or other filth followed by a good coat of ren wax. I would also do a little polishing and waxing to the horn? hilt. Others my have better suggestions on how to clean this, but this is how I would do it.
Best,
Robert
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