iphone 4 not working in docks car stereo anymore

iPhone 4 not working in docks/car stereo anymore...
location: apple.com - date: October 14, 2012
Hi guys,I've done a lot of searching and it seems I'm not along with this issue, although none of the previous solutions have worked for me. My iPhone 4 (os6) has recently stopped working with docks - in that, it'll charge but now allow any music playack, all of a sudden  This is a major problem for me as it also means it no longer works in conjunction with my car stereo! So far I have;-: cleaned the dock connector on the iPhone and on the car lead-: tried different iPhones in my car (with the same setup - 4 + os6) in my car and they work fine-: tried resetting and restoring my iPhone from backup, twice-: tried the iPhone in different docks at home with no luck 
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