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Toluene is clear gold. Noxious,carcinogenic, and bad for the skin. But an awesome cleaner. Hard to find these days because of the cautions, but great stuff for its intended purpose when handled...

You should toss it HW!
Into the oven, at 120-150 f, soak some q tips in acetone, some in kerosene, and some in toluene if you can find it (contact cleaner, or brake cleaner). Warm up the stone and...

Still not set,, that is a crazy hard stone as I recall. May need another ark to cut it against, ;)

Nice timing. I happen to be going there before the weekend. Gonna check out there arks online. I would presume the soft ark would be more for tools, the extra hard for razors?
Want to grab a half...