you can oil it, and rub it against another fine stone to clean it. You can also go to a machine shop, and ask them if you can have a cup full of the dust that has accumulated under their bench grinder..... make a slurry with kerosene, apply the slurry to a flat piece of steel and work your stone around on it. In both cases, rinse well with a good solvent.
NRA Life Member
Freedom has a flavor the protected can never taste...
USMC 8652, 2531, RVN Jun '67, - May 69
Some of my toys