I soak all water damaged boards in alcohol. The alcohol will displace any water in any tiny hidden areas. It will dry very quickly. After cleaning dry with a heat gun on low or a blow dryer. Even distiller water is ok to submerge the board in. It is the electricity flowing through it that causes the damage to the board. After saltwater submersion the first thing to do is to rinse in distilled water to get the saltwater out. Definitely sounds like a new dock connector is needed. Try swabbing the dock connector out with a toothbrush and alcohol I have fixed many phones with just that. It fixes no charging issues as well sometimes.