They're all rumored to use Dr. Bronner's ... in soap. It's mixed with an alkali, which is sodium hydroxide for bar soaps and potassium hydroxide for liquids. In this case, let's do liquid soaps.

Narrator: Here's how four soap factories create their products. Dr. Bronner's Magic Soaps has been around ... Then essential oils like peppermint and lavender are added. The final soap is cooled ...