Well...according to the FDA, they don't completely. Hand sanitizers do kill some germs, but when it comes to protecting you against things like E. coli, salmonella, H1N1, staph infections and the flu...they aren't as useful as you think.
On their website, the FDA wrote, "Consumers are being misled if they think these products you can buy in a drug store ...will protect them from a potentially deadly infection. The FDA has not approved any [of these] products."
They state that washing your hands with warm water and soap for 20 seconds is still their recommended method for avoiding bacterial and viral infections.
FDA
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