Cleaning PCB track side?
The Radford amplifier I'm currently restoring uses a printed-circuit motherboard to support the audio and PSU boards via edge connectors. I don't know whether it's the effect of fifty years in a domestic (possibly smoking) environment but the tracks look very 'oxidised' and dull.
It doesn't matter in the slightest -- the electrons don't know any better after all -- but it would be nice to clean the tracks up a little before applying a protective lacquer coating. Can anyone suggest the best way to do it? Or could the track side be re-tinned if one was careful not to immerse any actual components?
I've defluxed the board with propanol and toothbrush in the time-honoured way but even vigorous rubbing with cotton buds and so on hasn't done anything for the appearance of the tracks.
Any advice gratefully received...
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