![]() For oscillator circuits it may be necessary to clean it off but only if the oscillator proves to be unstable because of it. so it is not necessary to clean it off in most circumstances. Resin flux is inert and a pretty good insulator when hard, is not considered active when not at soldering temp. It may still be found in some brake cleaners, but most have switched to an non-chlorinated alcohol or ethylene base. Trichloroethane was a good cleaner for circuit boards is mildly toxic (drunkenness effect, liver, kidneys, defat skin ) and is a chlorinated solvent that has been banned because of ozone depletion. You may suddenly find yourself and the surrounding area engulfed in flames if the vapor reaches an ignition point.Ĭhemicals like toluene, acetone, certain paint thinners, etc are also highly flammable, are absorbed through the skin, or by breathing fumes and can cause health (defatting of skin, nervous system, reproductive) problems, Some such as acetone will also dissolve fiberglass resin (the circuit board) and many plastics used in components. ![]() ![]() It evaporates readily easily forming a flammable vapor layer that is heavier than air and can travel far from the source in a very short time while remaining at almost explosive flammability levels. Please don't use Coleman Fuel (white gas) as a cleaning agent. Distilled water usually won't cause a residue, but bottled water that is not distilled will. The residue (discoloration of the mask) is probably because all of the flux has not been cleaned off properly and is leaving a residue which causes the discoloration.
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