Science behind using hand sanitizer
Doctors recommend washing hands with soap and water whenever possible because hand washing reduces the amounts of all types of germs and chemicals on hands. But if soap and water are not available, using a hand sanitizer with at least 60% alcohol can help you avoid getting sick and spreading germs to others. The guidance for effective hand washing and use of hand sanitizer in community settings was developed based on data from a number of studies.
Alcohol-based hand sanitizer can quickly reduce the number of microbes on hands in some situations, but sanitizers do not eliminate all types of germs.
Many studies show that hand sanitizers work well in clinical settings like hospitals, where hands come into contact with germs but generally are not heavily soiled or greasy. Some data also show that hand sanitizers may work well against certain types of germs on slightly soiled hands. However, hands may become very greasy or soiled in community settings, such as after people handle food, play sports, work in the garden, or go camping or fishing. When hands are heavily soiled or greasy, hand sanitizers may not work well. Hand washing with soap and water is recommended in such circumstances.
Although few studies have been conducted, hand sanitizers probably cannot remove or inactivate many types of harmful chemicals. In one study, people who reported using hand sanitizer to clean hands had increased levels of pesticides in their bodies. If hands have touched harmful chemicals, wash carefully with soap dispenser.
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