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If you want to get slurry you should not clean its surface after use. It'll build up slowly. If you use them with water there's no need to clean them anyway. if you'd like a slurry stone I can get...

What's the grit of your usual final polishing hone?
I never saw swarf with a Thuringian hone. Honing itself will hardly create any slurry. The edge does improve after a coticule IME.