'''Gorazd Preloznik''' you did not tell us how you cleaned it. Water damage is the hardest to repair since virtually any part may got damaged. Assuming you cleaned it wll etc., and since you already replaced the battery, my next suspect would be a failed Charging port/USB PCB. I’d replace that next. Should be part number GH96-12616A. After that you know that the damage is definitely on the main PCB.
+
+
=== Update (02/17/2020) ===
+
@Gorazd Preloznik since you already replaced it you now know that the damage is actually on your motherboard. Time to take a look at that. Post some good pictures of that board with your question so we can try to assist you finding the problem
[br]
'''Gorazd Preloznik''' you did not tell us how you cleaned it. Water damage is the hardest to repair since virtually any part may got damaged. Assuming you cleaned it wll etc., and since you already replaced the battery, my next suspect would be a failed Charging port/USB PCB. I’d replace that next. Should be part number GH96-12616A. After that you know that the damage is definitely on the main PCB.