Do hand sanitizers really kill 99.99% of germs? How can they prove that’s true?
In: Biology
Hand sanitizers will kill huge amounts of bacteria on your hands, but will not change the environment that they grow in. Once the effect ends (that is, the alcohol evaporates), surviving bacteria and new ones from the environment just go right back at it.
Washing hands with soap is really the best way to go because it actually changes the environment of your hands (its microbiome) for a period of time, making it inhospitable for the bacteria to live in the first place. As a result, they take a lot longer to come back.
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