Fort Erie, ON
|reply to Black Box |
Re: Anti-microbial soap recalled over microbial contamination
said by Black Box:Temperature makes zero difference as far as the ability to kill bacteria. In fact, numerous studies have shown that the bacteria on one's hand before and after washing is the same no matter if cold or hot water has been used. The only time a difference is measured is related to the length of time one scrubs their hands.
Temperature matters as it softens the dirt and helps the soap to bind to the oily molecules better. You can feel the difference after washing with hot water in contrast with cold water.
In other words, washing for ten seconds with hot water is worse than washing for 30 seconds with cold water.
10 for 30 is likely worse, but 30 for 30 is definitely better. It's the removal of foreign material that's making the difference for hot water. More removed means less bacteria left behind.
Keep It Safe, Stupid!
Yes, I CanChat. Can You?
Fort Erie, ON
No, it's not "definitely better" - in fact, it makes no difference at all.
The whole idea that you need hot water to wash yourself or even clothes has been a myth longer than any of us have been alive, yet even as far back as the 1930s people were starting to figure out that it's washing action, not temperature, that cleans. The one study linked to from the NYT article even mentions that using cooler water is not only beneficial as far as your skin goes, but even has "economic benefits"
I'm obviously not going to convince you otherwise, but regardless of what anyone may think, I have zero issue washing my hands with much more comfortable to me cool or lukewarm water, and am confident knowing my hands are just as clean as anyone else who washes the same way in hot water.