I have mixed feelings on some of the comments.
In regards to marring with brush/mitt/pressure washer, there are obviously benefits and disadvantages to both. When I wash a medium-soiled vehicle, with a sheepskin mitt, and rinse THOROUGLY in a rinse bucket, I still find small pieces of dirt that didn't come out, requiring another thorough rinse. Still, small particles persist (I can feel them if I squeeze the mitt, then rub my fingers together.)
I don't know about brushes, but the Boar's hair (although ridiculously expensive, especially at Griot's) bristles seem to be longer and slightly farther apart, meaning a rinse in the bucket would seem to thoroughly flush the dirt, easily. A sheepskin mitt has fibers that are much more close together (it's a tight nap fur!) than the Boar's hair, the reason dirt gets trapped. Microfiber is worse. The fibers are so close (a reason they work so well for absorbing water) that dirt is next to impossible to flush throuoghly out (from my experiences with the Sonus Der Wunder Mitt).
A Boar's Hair Brush, according to Griot's Garage.
"This brush is probably the safest way to clean surface grime from your car's exterior. Boar hair is the only natural hair that can keep its shape without falling limp when soaked with water. Other "horse hair" brushes are stiffened with nylon which, like polyester, can scratch your surface. Manufacturing this brush is very time consuming. First you have to catch and shave a boar! Then each hair is hand collected, lined up with the split ends out and placed by hand into the hard plastic block. The ends are then flagged (splitting the ends again) to make them even softer. Just a quick shake in water will free the dirt, letting it drop to the bottom of your bucket."
http://www.griotsgarage.com/catalog.jsp?L1=L1_1000&L2=L2_1001&SKU=66073
I believe it, maybe I'm gullable. It sure sounds right, though.
I have had little experience with a power washer. The one time I used one on a car was my sister's vehicle, at a Car Wash facility as I rinsed the dirt off so I could safely QEW (but I ended up using the wash bay's soap and water, instead of QEWing. I plan on detailing it for her birthday in Spring). I'm not aware of the PSI, but it did not seem that high. I held the tip approx. 2 1/2 feet from the surface (was that too close). The dirt was ground into the paint surface and created unusual streaks of bright white (the color of the vehicle), while other areas were a duller white. The streaks were like a water drip sliding down the paint. Weird.
So I would love a Boar's Hair, but can't afford one. It'll be sheepsking until then.
Moving on....
I have some questions about "time-savers." When I detailed a Silverado single cab it took me 9 hours for the same process as Mark's. Is that a lot? Doing IP then FPII and Zaino sealant took 5 hours. So, on a vehicle similar to this, how long does it usually take you for a "coat" of polish? It took about 1:45 for me. 3.5 hours for an ENTIRE vehicle would be miraculous for me. I would love it. But working alone, it takes me the whole day.