In the archives of the Center for Disease Control and Prevention, there is an article entitled, "Guideline for Handwashing and Hospital Environmental Control". 

Here is a brief excert of the introduction.
"Handwashing is the single most important procedure for preventing nosocomial infections.  Although various products are available, handwashing can be classified simply by whether plain soap or detergents or antimicrobial-containing products are used. Handwashing with plain soaps or detergents suspends microorganisms and allows them to be rinsed off; this process is often referred to as mechanical removal of microorganisms. In addition, handwashing with antimicrobial-containing products kills or inhibits the growth of microorganisms; this process is often referred to as chemical removal of microorganisms."

The CDC words this to indicate that the use of antimicrobial-containing products provides additional control/prevention of microorganisms.

The document goes on to include recommended practices for handwashing.
"Antimicrobial handwashing products should be used for handwashing before personnel care for newborns and when otherwise indicated during their care, between patients in high-risk units, and before personnel take care of severely immunocompromised patients."

The full document can be access through the title link at the top.