On Jan 19, 2017, at 1:12 PM, Alan Hightower <alan
at alanlee.org> wrote:
One caution about isopropanol. I keep a lot of 99% around for
post-cleaning electronics assemblies, soldering, etc. I used to use it
as a general cleaning and de-greasing agent for most vintage computer
things until several plastic and a couple painted surfaces showed
changes not in color but specular reflection. It's like a change in flat
vs gloss where you could see my swirl marks, etc I made while cleaning.
I was able to mostly smooth it out later with more diluted solution, but
it surprised me.
If using isopropanol to clean, I recommend starting with a 70% or less
(dilute with water) drug-store type solution first until you know your
surface is safe.
Starting with higher grade (90% or more) diluted with distilled water might be worth
doing, at least for sensitive cases.
Also when cleaning anything electronic, especially in
dry winter, make
sure you are well grounded. If your house is built on a slab and you
have an exposed concrete floor in the lower level, consider moving your
work-shop or work-area there!
I bought an anti-static desk mat and wrist strap some years ago. They aren't all that
expensive and very much worth having.
paul