To day when I have been out I picked up 3 old sharpening stones. They looks old and covered in very old oil. What's the best way to clean them up? They look like white marble under the oil and fine grain. for the 3 of them it cost me £4.00 .Would soap and water be best or a spirit based cleaner?

sharpening stone by carlhamer, on Flickr

sharpening stones by carlhamer, on Flickr

sharpening stone by carlhamer, on Flickr

sharpening stones by carlhamer, on Flickr
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