TECH GURU's out there, how to clean Circuit Board?

Maybe better to use q-tips with cleaner, so that you don't have to spray directly onto the board, and risk stuff disolving and being carried to even less accessible areas. I have done this to clean excessive flux off parts I was repairing in the past.

This stuff would probably do it if not used too liberally.

http://www.radioshack.com/product/index.jsp?productId=2102649&cp=&kw=cleaner&parentPage=search

.Davehrab...IKYC*

* I know your coordinates!
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There are several products made to clean circuits. If it weren't pouring down raining outside I'd go out to my car and get one so I could read the label to you. Find a product made for contact cleaning, get a small stiff brush, and go at it gently. I like to use acid brushes (that's what I call them). They are about six inches long with fairly soft bristles. I cut the bristles to about half their length for firmer brush.
I do this all the time. If the board is removable, take it out and saturate the offensive area and brush if needed.
This is not a problem if the proper product is used. Be careful because as one of the previous posters pointed out, some can harm plastics. Good luck and let us know the results.

Timrhu...Contact cleaner is for contacts! Some electronic parts will not take kindly to such treatment. (Don't ask how I know). I know Freon is safe, but you can't get it. I know that a safe Freon replacement cleaning fluid exists, and I wish I could give you the name of the stuff. Do some research.

>> 03-09-06: Rapogee
>> Thank you very much guys, very helpful.
>> Just to clarify, I tried the micro vacum and compressed
>> air and that did not work. There is hair and dirt still
>> sticking,

Rapogee, thanks for the feedback! I didn't think that compressed air would work on the greasy grime.

The MG Chemicals Flux Remover looks very much like the Chemtronix stuff that I recommended. FYI: the Chemtronix stuff is an industrial product that is used in my engineering lab here where we populate PCBs to test out some of our ICs that go into cellphones. My recommendation was *not* a butt-pull - we use this stuff nearly daily to get guey stuff off our PCBs esp things like flux paste/fluid. Like the pix on MG Chemicals webpage, the Chemtronix can comes w/ that red colour straw nozzle that allows us to point the fluid more-or-less exactly where the guey stuff is. We have *not* ruined any PCBs so far & we have been in operation for over 10 years!

I was thinking of this last eveing & here is another idea: how about using "Goo-Gone"? I have used it to remove several sticky things (like stickers on CD jewel cases, airport security stickers on suitcases) but never on a PCB so far. This Goo-Gone is citrus-based (atleast the one that I have) & it does a great job of removing guey stuff. I've used some alcohol post Goo-Gone to get do the final clean-up. In your case, use a hair-dryer to dry the PCB thoroughly + let it air dry for 24 hrs before turning on the amp.
IMHO, this should really do the job for you. FWIW.