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Oil will penetrate a stone, if left on. It can take weeks or months of soaking to remove all the oil.

Be careful with soaps on synthetics, it can break down the binder on some, in seconds on some...

Yea, I have tried it and it is ok.

Probably it became a thing, because if your razor needed a bit more, a guy had the lather at hand, so slapping it on the stone and giving it a few laps was a no...