I just pulled out a stored eGo PCC and noticed that the charger has a green build up on it. It must have had some juice on it that I overlooked when I put it into storage. I've been working on it with q-tips, toothpicks and alcohol and have gotten some of it off, but not all of it. It does seem to make contact with an eGo twist when I place it in there, but I'm not sure if it's safe to use because of the build up. Any thoughts?