On Fri, 24 Jul 2015 17:45:00 -0700 (PDT), wrote:


THE PRODUCT IS
http://shop.advanceautoparts.com/wcs...3_pri_larg.jpg
contains a naptha. I conclude the naptha burns off with flux.

Naphtha does not oxidize (burn) off anything. It dissolves and then
evaporates. If you're lucky, it takes the diluted flux with it. If
not, it leaves a residue of evenly distributed flux, in a very thin
layer. Of course, if you wipe or blot it off, the flux goes with the
solvent.

http://www.crcindustries.com/faxdocs/msds/5101.pdf
Looks like a mix of naphtha, difluoroethane, hexane, dimethylbutane,
methylpentane. All of these ingredients evaporate. At the bottom of
section 9, it proclaims:
Percent volatile: 100% estimated
which means that the cleaner leaves no residue. However, that does
not mean that dissolving an unspecified type and amount of solder flux
with the cleaner also does not leave a residue. For example, water
soluble fluxes do not easily dissolve in organic solvents and do
better with hot water as a flux cleaner. Other types of fluxes (i.e.
no-clean flux) are made to be left in place on the PCB.

I guess you'll just have to test the cleaner. Take a sheet of clean
window glass. Lay it horizontally flat. Spray some of the CRC
Electronic Cleaner on the glass. Allow it to evaporate. If not, blot
it dry but don't rub. Is there anything left on the glass? Repeat
with anything claiming to be both a cleaner and lubricant and you
should see an oily residue.

Incidentally, I use the stuff for cleaning automotive connectors.
Works quite nicely.

However, as with JIFFY LUBE, cleaned surfaces do not develop colors over time expect to darken the surface.

By colors, I assume you mean oxidation of the copper PCB traces. Yes,
cleaning off any protective coating of flux or goo will expose to
copper to atmospheric attack.

The spray is toxic in a closed area.

So am I.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558