Looks like you used the correct soap although it wouldn't hurt to try Palmolive.
I really hope the treatment works for your son. I wish I can tell you it will. Becasue the inventor of the remedy was selling the information, he didn't share customer feedback to the public. We don't know its limitations, troubleshooting ideas, or what to do during recovery (the ebook was surprisingly silent on this issue). Hopefully people contributing to this thread will help here. Please keep us posted whether positive or negative.