Why can soap clean my hands off oily stuff like grease when soaps themselves are made largely of fat and oil?
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Soap molecules [create a chemical bridge/bond](https://kidsclinic.sg/wp-content/uploads/2020/04/how-soap-works.jpg) between fats/oils and water. One Hydrophyllic end is water soluable and the other hydrophobic one is fats/oils soluable, so the soap allows the oils which contain dirt & bacteria to be mixed with and rinsed off with water. This is the same way soap will kill some bacteria and viruses, one end mixes with the lipids (fats) that make up their body, breaks it up and thereby kills the bacteria or virus.
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