Just as a FYI, or maybe a How-to the way I do car washing in the rain, normally I only do this in warm weather since I am going to get wet. Wear a raincoat and bathing suit, and shoes that can get wet (like the type you wear to the beach to keep from burning your feet). Then go out to the car with your wet soapy sponge and pail of soapy water. The results are usually pretty good, but it's easy enough to miss spots, and you aren't doing the wheels or lower parts of the car this way. It's really a low effort way to do a partial wash with good water that's not going to leave hard water marks. Check the weather radar before starting!