Default [Q] [HELP] Charging dock problem

I bought a charging dock after I bought an Xperia Z last October. I was able to use it and was happy about it but after a few months, the charging from charging dock became slow, not as fast as the cable connected on my Z. Charging at the Charging Dock is frustrating so I decided to forget about it and went back to cable charging. I noticed that it started after Typhoon Haiyan soaked my Charging Dock with seawater. I dried it up for about two days and was glad that it was still charging but it's just that it's really charging slow. Can somebody help me about it?