On the car washing thing, yes, that is a pain!
Something else that annoyed me while washing... I usually have the radio on when washing the car. With this car, if I open the drivers door, the radio switches off! It's obviously assuming I'm getting out of the car after parking up... whereas in reality I'm already out of the car, I'm just opening the door to wipe the sills or something. In order to avoid this, I needed to leave the ignition on... but then I get a warning bong every time I open the door!
The car I saw the button on the keyfob... I think it was a Volvo.