Re: Cleaning dirty "Push Push" switches
One method I've used on (similar) long record-replay switches on tape recorder PCBs is just to apply a soldering iron to each individual soldered pin of the switch and, while the solder / pin (and therefore the associated switch contact) is hot, move the switch rapidly back and forth a few dozen times.
Repeat until every section of the switch has been 'heat treated' in this way.
This has got me out of a jam a few times where I have not had the time or it has been too physically difficult to remove, dismantle and properly clean the switch as I would obviously prefer to do.
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