How do water spots cause a car to stop functioning? First, you can absolutely wash a car in the sun and not get spots. With properly filtered water you won’t g

How do water spots cause a car to stop functioning? First, you can absolutely wash a car in the sun and not get spots. With properly filtered water you won’t get water spots. I wash my black car in the sun because I don’t care about water spots. It’s a car, it gets dirty and wet and clean again. It’s a piece of crap but it never stopped working because it got wet.