Commodore 1701 tarnished RCA connectors

[vol.2]

there's a product called Caig Deoxit. put a little bit of that on a magic eraser and shine them up

i would go through all the pots in the set as well. with that level of dirt inside, the pots are bound to be filthy and cleaning them all thoroughly with Deoxit will eliminate inevitable glitchy issues

that way if a symptom appears you'll know it not dirty pots. assuming you penetrate the pots correctly and twiddle them a sufficient number of times (I once was told 50 times by a old tech many years ago).