surface disinfectant

lamb l.a.m.buisman at
Tue Mar 20 15:07:19 EST 2001

20% of household bleach is maybe 1% ?
But the stench !!
Give me ethanol or isopropanol any time.


nmaccallister at wrote:
>Judy,.. isn't 20% rather high?  I believe we used a 1% (..or was it
>0.8%) to kill the spores left after 70% IPA wiping.  Isn't it true that
>Bleach can "pit" stainless steel,.. and must be used with caution?..
>(Like remembering to wipe it away after 10 mins)  Just like with the
>alcohol (where 70% kills better than 90%) the stronger bleach may also
>be less effective.  
>One hood-service technician did advocate putting a stronger bleach
>solution in a pan and leaving it in the (closed) flow hood over the
>weekend once-a-month (esp, to clean the HEPA filters),.. but I still
>worry about corroding that S. Steel,.. so I haven't made it a common
>practice.  Any advice?
>P.S.,  I have started the "mold/spore titers" you advised me on last
>month,.. so I am opening a number of plates in the hood these days.
>Some of them are immediately perceptible odor-wise,.. so I am concerned
>about spores as well.  (20%,.. huh?)
>And, yes, I will ask my friend down the hall to see if I can borrow some
>BAC (as the other posting suggests),..  1% again?,.. and is it kinder to
>SS?  Is it effective against conidia?

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