You can try spray contact cleaner in there, then inserting and removing a few times to see if that cleans it up. Badly corroded ones may need more work. If it'* a sealed plug, and is bad, it may need to be replaced (sorry - not familiar with the type from your year). If it is open in the back, the connections are generally held in with a raised part that clicks into the plastic to hold it in. Pushing in on the wire a bit, and getting something like a dental pick inside to push in on that raised part will allow it to pull out. Then you can clean it up.
Black 2000 SSEi, Silverstar Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, drilled 180 degree thermostat, Intense FWI, PCM, shift kit, and 3.4 Pulley. Solid front mount.