@sixwheeledbeast
When not connected to power, a lot of elecrronics survive water for a shorter (sometimes longer) period.
Please "wash" it again with pure alcohol (medicine or even better technical iso-propyl or similar, do not remember proper name right now) and then let it dry out in closed bowl of rice (or if you have silica) for a few days. Take care of camera module (remove forehand if possible). Of course all that without battery