Originally Posted by Vipfreak
Yep, also heat which... some places don't do to cut costs...
Washing with hot water does nothing to kill germs on your hands. It can never be hot enough without burning you since it would have to be pretty much at the boiling point for enough time to kill the germs. Any water temperature you could actually put you hands in without second degree burns will only make the germs wet.
As long as you use soap and wash for the proper amount of time, cold water is just as effective as any hot water you could safely put you hands under.