A Hand sanitizer is a cleaning agent that is in the form of a liquid, gel, or foam that is generally used to clean the hands and rid it of infectious agents. The best thing to do is to use soap and water to clean your hand while giving it up to 30 seconds to work. In case you are unable to get your hands on soap and water, a sanitizer comes handy. How to Use It? Put about two pea-sized drops on the palm and then quickly rub them all over the bottom and top of your palms. Ensure that you don't miss the webs of your fingers and the back of your thumb. You need to ensure that you cover 100% of the surface of your palm, the back of it, the webs and the fingers.