>From my experience, I would agree with the results of this experiment.
Contact time is more important, scrubbing action is also important for
physical removal of dirt.
Warm water is for comfort level and for slightly better dissolving of dirt
and suspension of oily residues.
Also, contact time and physical scrubbing have antibacterial effects, as
good or better than antibacterial soaps.
Michael L. Hayes
-----Original Message-----
From: Strang, Mike [mailto:Mike.Strang@us.fjord.com]
Sent: Friday, February 28, 2003 2:23 PM
To: HACCP mailing list (E-mail)
Subject: Hot water and hand washing
I'm really enjoying the exchanges concerning the use of hot water for hand
washing.
Allow me to add an interesting twist.
My boss's daughter did a hand washing experiment for a school science
project. She used various combinations of water temps, detergents, and
contact time to compare total plate counts and ATP swabs.
The primary conclusion? Contact time was the most important factor. A quick
wash with expensive anti-bacterial soap and hot water was not as effective
as a 30 second wash with cool water and no soap. Her study was very
amateurish, and probably not scientifically valid, but the results were
interesting.
Mike Strang
Quality Control Manager
Ducktrap River Fish Farm, LLC
57 Little River Drive
Belfast, Maine 04915
Mike.Strang@us.fjord.com
Phone: 207 338-6280
Fax: 207 338-6288
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