Washing Hands in Cold Water Removes as Many Germs as Hot
A small study conducted by scientists at Rutgers University-New Brunswick in New Jersey dispelled the popular myth that washing your hands in warm water gets rid of more germs than washing them in cold water.
The study involved 20 participants asked to wash their hands, which had been exposed to harmless germs, 20 times each. Water temperature ranged from cold (59 degrees F), to warm (79 degrees F), to hot (100 degrees F), and participants used varying amounts of soap.
According to the researchers, neither water temperature nor the amount of soap used affected the number of germs removed. What did make a difference? Washing hands for at least 20 seconds and and taking care to wash every surface of the hand with soap and water.