iPhone 4s won't charge

Hi!

I have a iPhone 4s that took a swim. Everything seems to be working perfectly, except it wont charge.

I have replaced the dock-connector and the battery, but nothing has turned out working. The battery percentage keeps dropping as i write.

The charging symbol shows when the cable is plugged, but the phone doesn't charge. It is not recognized by itunes either.

However, if i plug the phone into a speaker-dock, music starts playing (from the dock). The microphone, loudspeaker and homebutton is working aswell, so i cant really figure out what the problem is. Is there any other parts i should try to replace?`or is there any other method i should try?

Any suggestions are welcome! i really need this to be fixed