Alcohol is not a terribly effective flux remover. I use a product called Flux-Off Aqueous by Chemtronics. I bought a gallon of this stuff from Mouser about 7 years ago and it's just amazing. You mix it 10 to 1 with water so a gallon will last you a long, long time. The $55 it cost for the gallon is cheap like borscht. I currently use it in a small (3 liter) ultrasonic cleaner but initially just used it in a PE container I got at the dollar store. Before putting my board(s) in it I'd warm up the solution in a microwave to about 40C, pop the boards in for 20 minutes, lightly scrub with a toothbrush, rinse in hot water and let dry on a paper towel. Perfect results.
Just checked, and in 7 years I've only used a quart of it, and for 4 of those years I used it in a small manufacturing thing I had going. Hundreds of ( small) boards every month. Very effective, very economical.
Oh, and it's not terribly toxic, nor does it have any strong odor, especially once mixed. Unlike those spray-can flux cleaners.
_________________ Bill
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