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Actually, the cleanup should take less than 5 minutes, you will not be able to remove all the lubricant, it is made that way. Just a little Simple Green or dish soap & brush
or
flush with WD-40,...

Here is another one I own, neither have ever been used; notice the difference in the color. The stones are impregnated at the factory with a lubricant, thus the grey looking "patched" complexion.
...

It's a Norton India oilstone.
It's not even close to 12K, tops out at 800 to 1100, there is little data on the old oilstones, but my pdf files from the company put it no higher. It feels higher grit...