Why You Should Wash Your Hands (And How to Do It Right)- why we need hand washing ,Proper hand washing and drying is the most effective method of preventing the spread of disease, as it removes the dirt and germs that can be spread to others and helps to keep the environment around you clean. According to the CDC, properly washing and drying your hands reduces your risk of getting sick with diarrhea by 33 percent. ...Show Me the Science - Why Wash Your Hands? | Handwashing | CDCAlthough people around the world clean their hands with water, very few use soap to wash their hands. Washing hands with soap removes germs much more effectively 9. Handwashing education and access to soap in schools can help improve attendance 10, 11, 12. Good handwashing early in life may help improve child development in some settings 13.