I would also like to know what method you used. The results do not look like coin tumbler or vinegar results. They look more like peroxide...but the soil might just be that kind in your area that water was enough. Do tell...
Thanks for the feedback. It did turn out great. I asked Earthworks to come back on and post the exact method he used to clean it, but I know it involves peroxide. Check back tonight, he should have posted by then.