I scrub my ceramic, diamond & natural stones with Bon-Ami, a fingernail brush and water. I then dry all my "stones" completely before storing them. Ceramic are stored dry, diamond ones are sprayed with WD and the natural ones are stored in a mixture of kerosene and auto trans fluid.
When I was a tool and diemaker, I submerged the stones in a large coffee can filled w/ mineral spirits w/ a press on plastic lid as did all the other toolmakers. The stones were never cleaned and were always ready to be used. I do the same in my home shop.....Fred