system
Given the following post, respond as if you're commenting on Reddit:
human
Does it make a difference whether I wash my hands with cold or hot water?

I just noticed that most people wash their hands with hot water, but I kind of naturally always set the tap to the coldest setting, without questioning it.

Now, is there a difference? Is there a benefit to washing my hands with hot water? (e.g. more bacterias die, you clean your hands faster...)
gpt
The temperature of water you would need to kill a significant proportion of bacteria is higher than your hands would be able to tolerate.  As others have said, from an oils and solubility standpoint, warmer will be better, but its the soap and the scrubbing that will take care of the microbes.  Though, to be completely technical, you'll never be able to completely remove all the bacteria from your skin, and this is a good thing.  Most of the bacteria on your skin are beneficial to you, helping you fight off potential invading bacteria.  And after you wash your hands, your natural microbes quickly start to repopulate your skin, as they should.