How to best clean / remove leaked 'electrolyte' from a pCB

[spacecho]

Hello All,

i have been re-capping an old roland synth (re-505) which has a number of leaky caps.

One part of the PCB shows evidence of corrosion (i think the electrolyte has penetrated the solder mask) It has also caused what appear to be about half a dozen dry solder joints.

What is best practice in terms of 'neutralizing' and removing this 'gunk' - i'm having trouble re-soldering on the pads that have been affected.

 

[joaquins]

I think isopropyl alcohol may help to clean, then some flux to solder and again alcohol to clean the flux. I used some acid or something like this to be able to solder on some old tube amp which has a lot of oxide on the PTP combs and sockets, I changed most combs I could but I couldn't find sockets to fit on the case as they were, it was a complete rebuild so no harm to anything when applying it, I wouldn't use so strong stuff on a PCB. I never had a PCB as dirt as you mention.

JS