Unfortunately Castile soaps leave a residue build up, they do not rinse completely out, especially in hard water. With any soaps, you can do a test, fill the sink, lather up your hands and then rinse them in the sink water. Do you see any residue or scum in the water? If so, then it is not good to use. I too had bought a wonderful bar before, but with my hard well water, it was no good. Sorry about the bad news MoorZ. Any time you have a shampoo or bar question, our shampoo ingredients expert can help you out for sure: http://www.dreadlockssite.com/profile/Heather?xg_source=profiles_me... Heather is simply the best advice person for all these......peace