Procter and Gamble is literally sounding the alarm to get people to wash their hands after they use the restroom. A soap dispenser blares after people use the bathroom. Here’s how it works: The toilet door locks are rigged with pressure sensors that connect to an alarm on the soap dispenser. When toilet doors are opened, the alarm sounds. It stops as soon as the button for the soap is pressed. The alarms are being tdested in fast food restaurants, schools, and offices in the Philippines.