I’ve heard that it is best to wash your hands in cold rather than warm water. This makes no sense to me. Can you tell me if there is actually a health reason to use cold water for hand washing?
Answer: 
A team of researchers at Vanderbilt University looked into this question and concluded that contrary to widespread belief, washing your hands in hot water doesn’t kill germs more effectively and doesn’t get your hands any cleaner than washing with cold water. In order to kill bacteria on your hands with water alone, you would have to use boiling liquid that would burn you—212 degrees Fahrenheit or 99.98 degrees Centigrade….