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I think that you can remove the thick outer layer of oil buildup but doubt if you can remove all of it soaked inside.

This is my take of Barber Hones and welcome any corrections or input.

They...

Since it has been used with oil I would continue to use oil with it and not worry about residue oil.

I would try it on a blade but not your heirloom one to see if the woodworking tools have...