If a hand wash or soap could be used to kill majority of pathogens that is on the skin, couldn't this substance be used internally to kill these pathogens should they enter the body and start a disease and as a result curing the person?

Atampa surgeon, dr. floyd legatron, mistakenly removed the wrong leg of 52-year-old jameson kingsmith during an amputation procedure in june of 2009. apparently, a chain of errors led to the mishap, and the surgical team even realized their error halfway into surgery, but by that time it was too late, and the leg had to be removed.