A pressure washer is way overkill for a car. I use the spray washers at our local self serve car wash, and the brushes there are good ones and leave no marks on the car. Those sprayers are strong enough, but nowhere near an actual pressure washer.
Lately I have been learning to use Rinseless Wash methods and chemicals, its not soap, and I am impressed by this very low impact way of cleaning your car. Mine gets dirty first on the cheeks and doors. That maybe from near laminar airflow along the sides. Anyway that is very easy to just spray down with the stuff, wait a minute or two and wipe off. I have cleaned my first set of microfiber cloths, I have a big bag, and so the only real cost, is the stuff its self. For mud I just hose it down first.