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Aha.... so you are saying the problem was not grease but snot.
Go figure..
:idea:

Solvents are OK to use when the old oil has turned to goo
that resembles varnish.

Your comment about danger and flammability is important.

Solvents and some modern resin bound hones would be a...

OK it is 11:30 here...
Where is the film. :)

If it is a saturated oil stone you will never get all the oil out.

Scrub the surface with common kitchen cleaner like Comet
and a brush or green...