I use high detergent auto Tranny fluid.
Cleans old ones up and keeps the good ones free of crud.

Tony Zaffuto wrote:
> While cleaning the two stones purchased on my return trip from 
> Saturday's PATINA sale, I've found what may be the quickest and 
> easiest method to rid decades of gunk.  Try using some Goop 
> handcleaner (available in the auto department of your local Wallyworld 
> and appears identical to DL Handcleaner from years past).  Rub in it 
> for a minute or two and rinse off with warm water.  Worked like a 
> charm on both stones.
>
> Tony Z.
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