Hindustan Unilever (HUL) is the largest soap manufacturer in India. To increase sales of its Lifebuoy soap brand, HUL launched health education campaigns promoting handwashing with soap. These campaigns educated people about invisible germs and how handwashing with Lifebuoy soap can prevent diseases like diarrhea. One such campaign, Swasthya Chetna, reached over 15,000 villages across 8 states. The campaigns were successful in increasing Lifebuoy sales and reducing disease incidence through improved hygiene behaviors.