Many thanks to all who replied to my question
with insightful comments.
It seems that the benefit of "questioning hand-washing practice"
is considered questionable. :-)
At least I have found a good example of
how a certain health practice could be well justified
without documented evidence for the benefit.
I'd like to thank Liz Waters for the following reference
which might be worth sharing:
<... a book about creating a market for soap in 20th century Zimbabwe
that discusses gender and marketing and the differential...>
Timothy Burke;
Lifebuoy men, lux women: commodification, consumption, and cleanliness
in modern Zimbabwe.
Durham: Duke University Press, 1996.
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