Headlight issue

Is there a thread on how to clean these connectors? For example, I am thinking I'd use cleaner like CRC electronic spray, and possibly a small brush, but these female connectors sometimes have the "green dust" corrosion. What's the fix for that replace the wire terminals? I apologize if I being blunt, but I see "clean bulkhead connector" alot, but actually getting it clean,especially the female terminals is rather challnging,if you start digging in them with pick,you might bend them oversize then it's a loose connection etc.