I just tried to clean my iPhone lightning charger port with the graphite out of a mechanical pencil and now it won't charge at all
Graphite is a really good conductor of electricity - so the chances are what you just managed to do is connect together all the contacts in the socket.

I think you probably need professional cleaning now.

If the phone had a removable battery, then I'd say remove it, grab some spray contact-cleaner from Radio Shack/Maplins etc &amp; douse it... but not while the contacts are still live.