Why must you use both soap and water to wash oil from your hands?

plz help me i hate chem.Why must you use both soap and water to wash oil from your hands?
That's because water and oil do not mix because water is hydrophillic and oil is hydrophobic. Soaps contains both hydrophillic and hydrophobic molecules.





So when your wash your hands without soap, the oil and water do not mix and the oil is not washed away.





So when you wash your hands with soap the soap sticks to the water and the oil sticks to the soap.