Alcohol-based hand sanitizers are products designed to reduce germs on the skin. They typically contain a high percentage of alcohol, usually between 60% and 95%, which is effective in killing many types of bacteria and viruses. These sanitizers are convenient for use when soap and water are not available. To use an alcohol-based hand sanitizer, apply a small amount to the hands and rub them together until dry. It is important to cover all surfaces of the hands, including between the fingers and under the nails, to ensure maximum effectiveness in reducing germs.