I taught my girlfriend how to make old fashioned lye soap over the weekend, and the single bar we made came out lovely. It should come as no surprise to those who know me that I know how to make soap. My family made soap on several occasions when I was small, and I think that explains in large part why I hardly ever cuss to this day. Once your mouth’s been washed out a few times with homemade lye soap, it stays clean for a long, long time.