If you’re like most of us, you buy a variety of surfactant products: for your dishes, for your body, for your clothes – some of them are quite expensive. Most of them are made of the cheapest possible stuff. It’s not really hard to do better than the manufacturers do. It’s also fun to learn how to read the ingredients of soaps in hotels and stores – yeah, that “vegan” soap bar with the “sodium tallowate” in it? That’s beef fat.