Why is washing your hands with soap important even when your hands are clean?

Washing your hands with soap is crucial even when they appear clean because many harmful germs (bacteria and viruses) are microscopic and invisible to the naked eye. Soap works by breaking down the oily film on your skin where these germs can hide, allowing them to be effectively lifted and rinsed away with water. This process significantly reduces the spread of infections and illnesses, providing a much deeper clean than water alone.