Season 2, Episode 18
How Does Soap Make You Clean?
January 7, 2001
Overview
Where soap gets its cleaning power from, why water alone can't get you clean, and where soap scum comes from. Behind the reason why people don't use soap to wash their hair.
Where soap gets its cleaning power from, why water alone can't get you clean, and where soap scum comes from. Behind the reason why people don't use soap to wash their hair.
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