Hand sanitizer is a gel generally used to kill the vast majority of viruses/bacteria/microorganisms on the hands. 
 

Alcohol-based hand sanitizer that is at least 60% alcohol in water (specifically, ethanol or isopropyl alcohol/isopropanol (rubbing alcohol)) is recommended by the United States Centers for Disease Control and Prevention (CDC),  The CDC recommends the following steps when using an alcohol-based hand sanitizer:
 

1. Apply product to the palm of one hand.

2. Rub hands together.

3. Rub the product over all surfaces of hands and fingers until hands are dry.

4. Do not go near flame or gas burner or any burning object during application of hand sanitizer.
    

In most healthcare settings, alcohol-based hand sanitizers are preferable to hand washing with soap and water, because it may be better tolerated and is more effective at reducing bacteria. Hand washing with soap and water, however, should be carried out if contamination can be seen, or following the use of the toilet. The general use of non-alcohol-based hand sanitizers is not recommended.
 

Alcohol-based versions typically contain some combination of isopropyl alcohol, ethanol (ethyl alcohol), or n-propanol, with versions containing 60% to 95% alcohol the most effective. Alcohol-based hand sanitizer works against a wide variety of microorganisms but not spores. Compounds such as glycerol may be added to prevent drying of the skin.

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