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Make a paste of TSP (available at most paint stores) and water. If you leave it on the stone overnight, very little if any scrubbing will be necessary.
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i use a small brush and Dawn on my whetstones for my knives as polishing stones are similar, just a lot finer. i scrub mine with a brush and Dawn, under hot running water in the kitchen sink, then rinse completely and just set them in the drain rack to drip dry.