The easiest to get and a very excellent solvent for rosin on PCB is
Everclear (ethanol 95%) which is available at any liquor store. A pint will
last a long time (unless you quench your thirst with it). It has the
advantage of dissolving old rosin as well as that from newly soldered
joints. While most parts are not damaged by it, it should be used by
applying only to the solder joints with an acid brush with shorten (1/4-3/8
length) scrubbing, rinsing and wiping with a paper towel. Done correctly
you get shiny joints with NO rosin.
Most of the time, except for looks, rosin from good solders does no harm.
You can do more harm than good if your cleaning isn't done properly.
Allen KA5N
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