Someone has got to ask:
What's the foam lance model/manufacturer that you are using?
How much total soap ounce-wise do you go through in the three (3) applications?
What is the model/manufacturer of the power washer? How much pressure do you use?
Are you using de-ionized water or softened- water?
It's hard to imagine myself doing a car wash (albeit with a power washer) outside in the sun, unless its late in the day or it's very cool temperature-wise.
(By the way, nice music with your video)