I personally have been using the 12v pressure (link I shared earlier) for some time now. The car cleaning guy doesn't come on Sundays and my usage means the car gets covered with dust on Saturdays. So on Sunday mornings, I take the washer out and give the car a good hosing down. Turning the nozzle produces sufficiently sharp pressure point that you cant hold your hand in the spray, this cleans off all the bird droppings etc. It also cleans off dirt that gets into hard to reach places- wheel arches, logo niches, bumper protector gaps, hinge gaps etc. Interestingly, I found that as compared to the cleaner guy who uses an entire bucket of water, the pressure washer can do the job in half a bucket or less.
Once the car is washed, I just wipe it down with a clean so called "MF"cloth
Ameyam