> On Jan 19, 2017, at 1:12 PM, Alan Hightower <a...@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