Sounds like there is still liquid in the phone. Whenever you get any liquid in a device you should open it up, remove the battery and then leave it somewhere dry and safe while still open to dry out. For days. Yes, I said days. There are to many places in a phone that moisture can hide and totally ruin a device.
So I would suggest doing the above and then after it is fully dry, try again. Otherwise you could wind up losing everything on it and having to get a new phone.