Normal soap does work but in a different way than antibacterial soap.
Antibacterial soap destroys the cell wall of the bacteria, ripping them apart and killing them in the process.
Normal soap just assists with mechanical removal, as in they get physically moved off your hands into the water and down into the drain.
Without soap at all they can cling to your hands.
Why aren’t all soaps antibac?
Because of cost and comfort. Antibac soaps are generally more expensive & damage your skin. If you use them all the time you might develop skin conditions on your hands or at the very least just get very dry irritated skin there.
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