The Bronner's Soap I used: http://amzn.to/11V4Pt6
I also get it in bulk here: https://www.azurestandard.com/?a_aid=p9oZYMWZ2Y

It seems that this recipe only works with certain bars of soap. I only use Bronner's soap that I've linked to above. Some of you have let me know that Dove does not work. I have been told that Ivory does. Perhaps it's the softer soaps that don't work but I haven't tested this theory.