I agree about finding out what the grease is.

Without knowing and from what you have told me, some one maybe taking
liberties with the process, possibly using a flux such as No-Corrode. That
is a stearite / stearate and not necessarily soluble in solvents such as
alcohol. Also it is not considered appropriate for fine electronic work
since it is somewhat corrosive. In that case the work may come back to
haunt you down the line.

If you wish to discus this further please feel free to contact me via email
to arrange for a phone call.

Albert

wrote in message
ups.com...
Alexander wrote:

I solder (wave) reguraly some PCB's.
After soldering the PCB's are "greasy".
I have tried brushing this off with a clean ESD-safe brush. but
all
this
did
was putting the grease on another spot off the PCB and leave some
brushstripes.
The same with all PCB-cleaners I have tried, some work well if
you
clean
the
PCB afterwards with some cloth. Unfortunatly not all produceb
PCB's
can
be
cleaned with cloth.

Does anyone have a solution for this problem.

I thought of a cleaner which cleans the PCB and dries up in
powder.
But
I
haven't found one.


I gather you want a cleaning fluid, yet say youve tried everything:
either they arent both true, or else youre out of luck.

Re drying cleaners, I guess you could make your own with clay and
solvent. The solvent mobilises the grease, the clay soaks it up, the
solvent dries out, and the clay falls or brushes off.
Clay: use heavyweight cat litter, crushed. Chalk might also work.
Solvent: whatevers working with your particular grease. It might help
if you told us what this grease was like, and where specifically it was
deposited.


Re the dishwashing option, in principle its possible to leave out the
water sensitive parts such as relays, covering their pads by hand, wave
solder, clean, then solder the remaining parts in by hand. I did this
years ago, though I can understand wanting a faster method.

I would first look for the source of the grease. Is it heatsink
compound? Goo from the ends of reeled component wires? How its
distributed on the PCB would give some clues.


NT