I also use dish soap on all my naturals after soaking in the simple green. Just scrub with a old toothbrush. I have had the simple green eat away at synthetic hones so do not recommend that however I do use dish soap on pretty much all of them and haven't had an issue. I do not use it for prolong periods just a drop on the toothbrush and then scrub away in sink with water running on stone. I even use with dmt and even with sandpaper to wipe away years of use.