wont turn on when I take it off of it's charger.

Pyrus, first thing you want to do, is to stop trying to charge it and to no longer plug it in. This could make a bad situation worse. You definitely should start off with this guideIt is for a 3G but essentially the same procedure for your phone. After that change the battery. A once exposed battery is definitely a cause for plenty of headaches later on. You'll be surprised to find out how many errors a water damaged battery can give you ;-) After that, reevaluate, clean again and see what you get. Should even a new battery give you the same trouble, consider changing the dock connector. Hope this helps, good luck.