It doesn't matter if you do a section, side, front, back, or the whole car before drying. The only factor is that it will spot if you let it dry. So you can do as much as you can before it drys. That being said, I've washed in full sun and only did about two linear feet at a time. There's no right or wrong way to do it. The problem most people have is not going over an area enuff times to make sure it's clean before they dry. By doing a large portion of the car before drying (I assume to save time) just don't leave dirt on the surface or you'll mar the finish. Hope that helps!
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