A 17 caliber brass cleaning brush works good on the female parts of a jones plug too.

LTG : )

A standard Scotch brillo scouring pad is a simple "magical" solution for Jones plugs.
Using stiff wire brushes? and chainsaw files? on these plugs is unnecessary and overly harsh on metal removal.
A person wants to save the plugs, not wear them down further, which is what these mentioned tools are doing.
A tiny dab of Flitz on the pad will clean these plugs up very well, remove the oxidation, and maximize electrical contact, just ensure all residue is gone with denatured alcohol.

For female plugs scrub with light guage brass brush on the outside and a tiny sanding file, not metal file, and ensure same residue is removed. Use pipe cleaners to check how you are doing.

I usually use earbuds to clean the females, along with electro-clean, worked sofar for me.