On Sat, 14 Jan 2017 00:11:25 +0000 (GMT), Dave Plowman (News) wrote:

Odd. Most people many many years ago found out that hot water aids the
cleaning process.

With simple "hygiene" hand washing most of the cleaning comes from
the physical actions rather than water temperature or soap. Dibbling
you finger tips under tap for 3 seconds sans soap does SFA. But
that's all many people do in response to "now wash your hands".

--
Cheers
Dave.