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When dirty clothes are in the soap solution dirt is of greasy matter when soap is  dissolved in water its hydrophobic ends  attach to dirt and remove it from clothes
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Soap and detergents help insoluble particles to become soluble in water. It makes the cleaning easy. Oil or fats are insoluble in water. Soap molecules has two parts- the polar head and the long hydrocarbon tail. The insoluble oil/fat molecules become associated inside the micelle formed by soap molecules with polar hydrophilic (water-loving) groups on the outside and encasing a hydrophobic (water-hating) pocket, which shields the oil/fat molecules from the water making it soluble. Once the dirt or fat molecules are dissolved in water, it can be rinsed away easily.
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