If I use a hand sanitizer, do I need to wash my hands?

If I use a hand sanitizer, do I need to wash my hands?

Answer: 

YES! Hand sanitizers do not replace proper handwashing. Although hand sanitizers can effectively kill some germs on your hands, they do little to reduce the surface tension between your skin and dirt/grease/germs. The sanitizer only has an effect on the outer layer of film on your hands. Some bad germs are still present. When washing hands, first wet your hands with warm water, lather with soap for at least 20 seconds, rinse with warm water, then dry with a clean towel.