The Signet tools are the best, but are they still available? I bought some from The Cable Company a few years ago, but I think they might not be made anymore.
There's something women use to take off makeup with . . . looks similar to a Q-tip, but much tighter cotton and with a better shape. One side is narrow and conical, the other is flat and round. Easier to fit into the space around the pin in the RCA. Usually sold in pharmacies in the makeup section.
You can dip in alcohol, but use the 99%, not the standard rubbing alcohol. Amazing how much black crap comes off.