Can a soap be dirty? In a sense that there are still some bacteria living on it.
In: Chemistry
Soap needs water to work. It does that by “wrapping up” particles of grime, bacteria and so forth in small balls of soap molecules. Those balls float around in the water you’re washing in and get rinsed away, taking the dirt with them. But to make those balls, the soap molecules need to be in water, both because that’s part of why they make balls in the first place and also simply to be able to move about and cluster. So everything works when you lather the soap up in water, but if the soap’s in a solid bar, it doesn’t. So whatever’s on the surface of the bar is free to stay there.
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