A couple reasons.
soap and water remove visible dirt. Sanitizer does not.
both require that you rub your hands together for a few seconds because that breaks up the membranes on the germs. You also have to wash all surfaces of your hands, and most people take more time and are more thorough with both at the sink. (Seriously, watch people using sanitizer some time. A lot of them won’t even get the backs of their hands. Fewer will get under/around nails)
Most people using sanitizer aren’t even using a sufficient quantity of the product.
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