When washing your hands with soap and water, does it make a difference whether you use hot or warm water versus cold water? —Dennis Breunig, Prairie du Sac, Wis.
Most of the time, no. When you wash your hands, you’re just mechanically removing soil and germs, etc. No matter how hot the water is, you’re not killing them. (You’d need boiling water to do that!) But if your hands are greasy, warm water will do a better job.