The headlight harness plug that connects to the bulb on the passenger side of my car is kinda screwed up. It doesn't completely connect and sometimes the headlight doesn't get any power resulting in....no light. Usually if i go over a big bump or jar my car by accident in any way the plug moves or disconnects or something turning the headlight off. So it kinda gets annoying pulling over frequently to bang on the light and turn it back on again. I looked at the plug the other day and it has some sort of dried black stuff in it. Not sure if its electrical grease or what but I think it is preventing the plug from going onto the bulb securely. Is there anything I could use to clean the plug out without harming it?