rightlane said:
I did not intend to ask about dawn. I asked about "Your washing theory". I have been here long enough to know about the search function. Since you have a power washer in your sig, I thought you would have more to contribute.
Sorry, based on your opening statement I thought you were being critical of the use of Dawn.
Anywho, the only time I use Dawn is in preparation for Zaino. I really don't see any other use for it other than striping wax and oils off the paint. I wash using the two-bucket method with either Z7 or Meguiars #62. A natural sea sponge is my applicator of choice.
The power washer I have in my Avatar is a picture of the actual model I own. A Honda GX commercial duty engine, and a Cat pump power it. It has a max psi of 2500 @ 3 gpm. I use the unloader and dial that down to about 700-1000 psi (700 is normal for a coin-op car wash). I start my wash by doing the wheels first. I spray the white lettering on the tires and inside the wheel wells with EFHI. After agitating the lettering, I rinse it all off with the PW. Then I rinse the entire vehicle with the PW. This is where I feel it is the most effective. I can remove 50-90 percent of the dirt present on the paint before I ever put a sponge to the truck.
The rest of the washing is pretty straightforward. One panel at a time with the two buckets, but I do rinse with the PW. I know the general theory is to rinse the soap off with a flow of water so that the soap-dirt bond is not broken, but the PW is much more effective IMO. The PW also is a great tool for keeping the water moving on the entire vehicle, no matter which section I am washing. This keeps the water from evaporating and creating water spots. When I rinse a soaped section, I just re-rinse another section and everything is kool.

With the proper technique, I can also sheet the water off, similar to the open hose trick.
Drying is handled by the good ole' Big Blues.
:wavey