rubbing alcohol works, but you should get the highest percentage isopropyl alcohol you can find to do it. you can wet it down with the alcohol and use compressed air to make it dry quicker.
I used to use this method. But, when I switched from a generic flux in a can to Kester 186, isopropyl alcohol no longer worked and in fact made things much stickier. I haven't found a method for cleaning this, but also don't care much because it's non-conductive and makes for a far superior soldering experience over the traditional flux. If anyone has a cleaning solution for this I'll try it. Either of you guys try those spray-on solvents with this flux?+1 for isopropyl alcohol. I apply it with a qtip. Usually works pretty well.
I use this.
Kester 83-1000-0186 Mildly Activated Rosin Liquid Flux Pen for Lead-Bearing and Lead Free Alloy, 0.33 fl. oz.: Electronic Components: Amazon.com: Home Improvement
Kester 83-1000-0186 Mildly Activated Rosin Liquid Flux Pen for Lead-Bearing and Lead Free Alloy, 0.33 fl. oz.: Electronic Components: Amazon.com: Home Improvementwww.amazon.com
I've ordered the MG Chemicals flux remover and the Kester 186 flux. I'll let you know how it goes.
Todd D.