iphone 4 leaking brown gooey substance when charging

iPhone 4 leaking brown gooey substance when charging
location: apple.com - date: April 13, 2012
Every time I charge my iPhone 4 with the Apple iPhone Charger (5 W) I get this gooey substance inside the dock connector of the device itself and on the charger. This started almost a week ago. The substance does not smell of rust or anything. The device itself is half a year old, never had contact with water, never ran too hot and was never dropped. It does run quite hot under heavy load and while being charged, however judging from many many forum posts that's a regular thing for the iPhone 4/4S. It behaves normally, charges normally and holds its charge just like you would expect from a regular iPhone 4. I don't think this is battery related as it only appears to happen when I'm charging the device (why would the battery only leak when being charged?). However, except for the polymer gel inside the battery, there's nothing else insid
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