What I've been doing lately is going to the do it yourself wash, but bringing my own equipment.
1) I start out with the sprayer on "soap" and get the car all nice and wet and a little soapy. special attention to the areas that collect dirt like the rear bumper and side skirts to try to get the heavy stuff off.
2) Then I blast the wheels,
3) and switch over to the "soap brush" attachment... but do NOT use the brush on the car. I just let it squirt all the soap out and drip it all over the car. This thing really puts out a lot of soap, so it works pretty well.
4) Then I use my own clean wash mitt and start at the top and work my way down. I know to do things properly I should have a rinse bucket and rinse the mitt after every panel, but since I try to do the car once a week, there isn't really any heavy dirt on it, so I tend to do the whole car.
5) Next I fire up the sprayer again and rinse everything off, and usually spray on a coat of wax on the "wax" (duh) setting. If I'm doing a real waxing, I skip this part, and move ahead.
6) Pull the car out of the bay and wipe down all the panels with my California Water Blade, which gets off the majority of the water, and then I switch over to The Absorber chamois to get everything in the nooks and crannies that the Blade can't reach.
6b) If I'm doing a real waxing, I do it here.
7) Admire, drive home.