Originally posted by Ruffdaddy
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Soap is an alkali salt that is formed by the mixing of a base (lye) and an acid (oil/fat). The soap salts are both hydrophilic (binding) and hydrophobic (repelling) and that combo is what lets the hydrophobic acids come "stick" to the dirt (also hydrophobic), lets them get wrapped up in water molecues and then easily washed away.
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