A while ago, I stumbled upon an article on cleaning PCB's of flux. I thought that I would show an example of just how good this technique is. The magic chemical is LePage's Polyclens. This can be had at most hardware stores for around $10, and is sold as a paint brush cleaner. Here is the link to the original article.
Disclaimer: This method has worked for me on all of the boards that I have tried. However, I highly recommend that you test your parts to make sure that the Polyclens won't attack them.
Use this method at your own risk.
Polyclens is a pink liquid that has some odor but is definitely tolerable. Place enough in a glass or metal dish to cover your board and place your board in. (Polyclens will attack some plastics, hence the non plastic dish.)
You can leave the board alone, or agitate it for quicker removal of flux.
Below is an image of a newly minted Xilinx Parallel Programmer, and as you can see, it is full of fluxy goodness. By soaking in the polyclens, all will be removed(see below).
Here we have an image of the cleaned board. As you can see, it looks like it's never seen flux. This was with about 20-30 seconds of agitation. Then I rinsed the board with water, patted dry, and used a heat gun on low to dry the board completely. In total, it took around 3 minutes to clean the board. Had I used the old method of alcohol, stiff brush, and a vacuum, it would have taken 10-15 minutes of constant labor.
Finally, here is a close up comparison of the 2 boards.
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