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Well the old oil can be removed by soaking the stone.

What you use to soak will depend on the stone more than anything. Degreaser/water is pretty universal, So is washing powder/water. Harsher...

yes with synthetics, much less so with naturals.

Synthetics tend to be pretty porous. And I keep any I own in containers and hone with a small baking tray under them. Snap style lid containers are...