Albert,

You were right about the soldering machine.
I (normally don't use it myself) cleaned the whole machine in the vacation
of out soldering man.
And the problem was gone (for a while).
When it returned I got very angry, we now have antoher person at the
machine.
To prefent the solder from oxidating we use nitrogen, which is won out of
air.
We use it both in wave soldering and reflow and the results of this are very
good.

And yes isopropyl alcohol is our primary mean of cleaning PCB's.

Alexander
"ALBERT C. GOOD JR." schreef in bericht
...
There are a couple of things that I am wondering about:

1. How is the "grease getting on the boards in the first place.
2. What kind of "grease" is it.

I had set up a soldering machine some years ago that used peanut oil as a
means of protecting the solder in the reservoir from oxidization. The oil
usually didn't touch the boards, but if it had isopropyl alcohol would
have
cleaned it off.

Albert

"Art" wrote in message
...
? Denatured Alcohol ? Flux Remover Sprays ? Etc.
"Alexander" wrote in message
...

"Jasen Betts" schreef in bericht
...
In article , 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.

Have you tried a dishwasher ?

most electronic parts store safely at 100C and are in waterproof
encapsulations....

Bye.
Jasen

Nice suggestion, but not all PCB's can be done in a dishwasher.
Even if I use less agressive tabs.

I have succesfull used a "proffessional" ultrasonic cleaner, but it
also
uses water and not all parts like water.
The grease is only on the solderside so I can use cleaners on that
site.