to clean the female contacts I used contact cleaner and a flossing brush... used Nolox on the contacts and dielectric grease on the plastic assembly and it now works like a champ and I'm back in business... used a clean brush to apply the Nolox...
this brush just may be the ticket for your CNC, truck, boat, power tool, computer, and what not come the need...
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NOTE:
Nolox electrical grease prevents the formation of oxides, sulfides and other corrosion deposits on copper, aluminum, and steel surfaces and conductors....
Dielectric grease is made by adding a thickener to silicone oil. It is waterproof and fireproof. It is a non-conductive insulator...
so keep it off of the contacts and use it as a connector sealer...