Why 70% EtOH for cleaning?

Jody K. Hirsh jkh141 at nwu.edu
Fri Jun 9 12:15:40 EST 1995

In article <1995Jun1.191457.1 at cc.newcastle.edu.au>, 
mdcabl at cc.newcastle.edu.au says...
>Hi all,
>I have a very general question.  I was told that 70% EtOH is more effective
>than 95% EtOH for sterlizing and cleaning surfaces.  Tradition of course is 
>use 70% to wipe hoods etc.  I had assumed 70% was used just to cut 
costs. Can
>anybody out there tell me why 70% is used? Just curious really.
>Allen Black
>Univ. of Newcastle
>mdcabl at cc.newcastle.edu.au
My understanding is related to the previous answers but slightly different.
I thought that you need some water to kill (lyse) spores, otherwise they just 
get dehydrated and preserved.

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