I found this and thought to share it since this has been discussed before. It is directed towards knife sharpening but I paste it here mainly for the cleaning technigue, not the honing.
We recommend using a light based oil to lubricate the stones. A light mineral or petroleum oil, should be used during the honing process. You can use water, but the honing oil should then be used to clean the stones. Honing oil does more than serve as a lubricant. Honing oil suspends the steel shavings and prevents them from clogging the pores of the whetstone. Whetstones should be cleaned after use by rubbing a liberal amount of Honing oil on the stone and wiping the excess away with a clean cloth. You may also clean the stone by placing it in a dish washer to help clean it up. Do not use a Cooking Oil, for it can clog the pores in the stone and ruin it from sharpening knives.