Don't wash it in the dun so the car drys fast. Wash it in the cooler evenings. So you dry it rather than the sun bake the marks on.
or wash it a panel at a time working from the top down... its not too hard to rinse it and then dry it as you go along
Yeah, sometimes i do this if i dont have time later in the day. Wash a side at a time, and the roof, boot, and bonnet seperatly.
