I'll start a bit differently: I forgot front right window half-lowered and the car was exposed about 30 minutes to heavy rain. I found the door and half of the seat wet from the inside, but circuits in door work good so far - power windows, audio, mirror control.
Is a car door designed to withstand such a situation? I am interested in both aspects:
Window accidentally left open in heavy rain.
Door (with window closed) opened for passengers in heavy rain, so built-in switches and speakers get wet almost immediately. Additionally, in some cases, rainwater carried by wind can be attacking the interior side of the door in sharp angles.
Is there anything what I have to do except of simply letting it dry? Or something to worry about?