There was a time, when the car was relatively new, and I had spare time (ie, no kids), that I would go to the DIY spray, do a good rinse, followed by the soap, and fill a bucket. Then I'd take out a cloth, hand wash it well, then use the wand to rinse it. But it costs a lot, since you'll run out of time, and also, if it's a nice day, there are always impatient people who get ticked off that you are actually washing your car. I lived in a house with a well at the time, so I never washed it at home.
Now, however, with the car 8 years old, and with kids (read: no time), I just rinse/soap/rinse, and be done with it.