Water coming out of the rear hatch is normal when you open it after washing. Mine does the same. But by chance do you a sounds system in the trunk installed by you or by the previous owner? If not sure about the previous owner look in the trunk and look for sub wires. Also could have been wired and previous owner removed wiring so not seeing them doesnt rule that out.
But speaking on first hand experience, since mine was pouring water through the dash like a waterfall, you need to pull the cover off the battery and then the cowling that goes up to the windshield. What can happen is more than likely if a system was wired in, they used the rubber grommet that seals around you main dash harness that goes into the engine bay to run the power wire. If they did like mine, they caused the huge rubber groumet to come loose from clamp that holds it down against the hole. Mine was completely free hanging. Douchbags probablet fought with the groumet and gave up and just closed everything back and didnt tell the owner. Took me like an hour to form that thing around the clamp and wedge it back in like it should be. They did poke the power wire throught the groumet but it sealed fairly well against the new hole that was poked.
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