What are three surfaces on the hands that must be cleaned?

Three surfaces on the hands that must be cleaned include the palms, which often come into contact with various surfaces; the backs of the hands, which can accumulate dirt and germs; and the areas between the fingers, where bacteria can easily hide. Additionally, cleaning under the fingernails is important, as this area can trap debris and microorganisms. Proper handwashing should ensure all these surfaces are thoroughly cleaned.