Washing out mouth with soap, also known as mouth soaping, is a form of corporal punishment, usually given to children for cursing (using profanity) or lying. It is done by placing a bar of soap, liquid soap, or dishwashing liquid in a person's mouth and sometimes, forcing them to ingest it. It was most common through the 1950s and its use has decreased since then .
This punishment still has advocates today, even though its use has diminished considerably in recent years in favor of discipline methods that are not considered violent or humiliating. Additionally, soaps and detergents can have potentially harmful results, especially if swallowed, including vomiting, diarrhea, irritation of the lining of the mouth and digestive tract, and in rare instances, pulmonary aspiration. A teacher in Rochester, New York was suspended in 2004 for washing out the mouth of a student for using vulgar language, but was reinstated after parents and family members of her students signed a petition supporting her actions.