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Talking about soapy water

Because oil is insoluble in water, it will form emulsion with water, so it is not easy to wash. The molecules of soapy water are composed of hydrophilic groups and lipophilic groups. When combined with water and oil, oil and water can be taken away by the molecules of soapy water, and then washed with water, so soapy water can wash away oil stains, so soapy water can wash away oil stains.