The correct way to hand wash, as told by a first-aid instructor was as follows:
1 Soap your hands all over thoroughly, up to the wrists,
2 Rub the soap in for the time it takes to sing "Happy Birthday to You" all through,
3 Rinse the soap off.
Most of us just give a quick rinse under the tap, with or without soap, but that is not sufficient. It is the thorough rubbing-in of the soap that kills the germs. We have drastically reduced the incidence of tummy-bugs by hand-washing after using the toilet, so let's do the same for colds and flu.