Across the United States, one in every 25 people will get an illness at the hospital. According to the Centers for Disease Control and Prevention, in just one year, 722,000 people were affected by healthcare-associated infections. About 75,000 of those people did not survive their hospital stays.

It’s a serious problem with a simple solution: Hospital employees just need better hygiene habits. Hand washing is considered one of the best ways to prevent the spread of disease. Unfortunately, according to a study published in peer-reviewed journal Health Psychology, less than half of healthcare workers wash up.

Luckily, the study also offered a novel solution. The team of international researchers, headed by Dr. Dominic King from the Centre for Health Policy at the Imperial College in London, found that either a pair of judgy, staring male eyes—or the scent of crisp clean citrus—is enough to encourage compliance.