When a bar of soap is combined with water and agitated the result is a lather, which is the formation of multiple tiny bubbles.
What do the bubbles do? How do they clean your skin?
When you mix soap with water, it lowers the surface tension of the water by separating the water molecules, as the soap molecules push up between them. Meanwhile, the other ends of the soap molecules that are attracted to dirt grab on to it. As multiple soap molecules attach themselves to the same piece of dirt, they eventually break it down into tiny particles, which then can easily be washed away. (Howstuffworks.com)
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