You could clean that one up then if that doesn't work go get a new one. But if you're set on getting a new one buy some dielectric grease and put it in there before plugging them in again. Should be less than a dollar at an auto parts for a small one use pack. Or if you want to protect other connections to keep that from happening again, buy a tube or small bottle of it for around 5 dollars and you'll probably never need to buy any again.