One of my recent purchases while on holiday was an old India Oil Stone. I have been trying to lap this hone, but I am coming into a bit of trouble. First I found that it is so hard that the only thing I can use to cut a slurry from this stone is a diamond plate. While I thought I had clean it up the remaining oil and gunk is gumming up the diamond plate. I have tried just letting it soak in a bucket of very soapy water. I used laundry detergent, about the same amount that I would use for about five loads of washing. Even doing this I had to stop and clean the diamond plate every minute or so.

So how do you deep clean an old oil stone? I don't have an oven, so I can't bake it. But would boiling it help?