[200q20v] a Chemist in the house???

McCoy, Charlie CMcCoy at visa.com
Thu Mar 8 07:00:55 EST 2001

I'm no chemist (but Dad has a PhD in physical chemistry) and he always has
me use "fresh" sealed distilled water (apparently letting d-water sit around
for a while allows Co2 to absorb, increasing conductivity marginally...but I
digress) for cleaning circuit boards as it is fairly non-conductive (tap
water, with it's impurities IS fairly conductive) and when dry will leave no
residue.  PURE denatured Ethanol (most stuff is 80% alcohol and has
impurities) has also worked well as a finishing rinse.


-----Original Message-----
From: Sylvester, Mike [mailto:Mike.Sylvester at sycamorenet.com]
Sent: Thursday, March 08, 2001 8:53 AM
To: 'Brett Dikeman'; Glen Powell
Cc: 200q20v at audifans.com
Subject: RE: [200q20v] a Chemist in the house???

Brett Dikeman once said:
I'm no chemist, but I certainly don't recommend the previous
solution(water?!?)  Somebody was dippin' into the secret stash when they
suggested that one :-)....If you don't want to go the route of c41/deoxit
etc, then windshield
washer fluid should be a much better choice than straight water....


What is wrong with water?  As long as you dry everything after, water will
less harmful than anything else.  Are you aware that when PC boards are
manufactured, like those used in the ECU, they are washed with water after
all of the components are soldered.  In the past when I've reworked a
computer board, e.g. change a resistor, I've taken the board to the bathroom
sink and washed off the flux.  You must of course dry it completely before
powering it.  This could be the tough part with the fuse box, since it has
many nooks and crannies.  Also, isn't windshield washer fluid about 95%

Mike Sylvester
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