I got quite good answers. thanks to everyone for participating.
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Hand sanitiser is high alcohol. So I take the hand gel, rub it over my hands, it comes into contact with the bacteria, and it kills them.
Bacteria in my body though, I can’t scrub the insides of all my tissue with alcohol. If I could, I’d damage a whole bunch of my good cells along with killing the bacteria or viruses. I can’t wipe down every part of my insides that’s come into contact with it.
It’s a little bit like asking why I don’t drink bleach to cure a cold. The bleach would kill me first. But for cleaning things outside my body, bleach is great.
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