Ulrich,
warm water, soap and brush. If not enough, try mild acids, then rinse
and dry with isopropilic acid.
Something this is simply not enough, if the corrosion reached the
inner layers of the PCB there is, IMHO, nothing to do.
Even solder resist becomes brittle and detaches from copper if the
corrosion comes from beyond. If this is the case I try to get clean
copper by gentle brushing, to expose the damaged area. Once I found
eroded tracks under an apparently good resist layer.
Marco IK1ODO
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