: He realized people were taking the soap but leaving before his speech was over. To fix this, he printed his entire "Moral ABC" philosophy directly on the bottles so they would read it in the shower.

The most common way people "discover" castile soap is by encountering the iconic bottle, known for its tiny, dense text that covers every inch of the label.

Today, castile soap is much easier to find, though its most famous brand remains wrapped in the same "loony" labels that once made it a cult favorite in hippie stores. Where to Buy Castile Soap