Funny, Mequiars own dealer website suggests a light power wash (1700 psi through a 45 degree nozzle) after machine compounding (without soap) to remove all deposits and set up the paint to accept the machine wax job.

Also, how many professional detail shops have you walked into (or even mobile) that are using a garden hose and nozzle? Maybe a high school Saturday fundraiser. Pros all use power washers (only maybe again 1700 psi and 45 degree nozzle). This is the only way to completely and efficiently remove all debris from door and body seams, mouldings, wheel wells, etc. and keep the car wet while washing.

Fail huh? I guess me and 90 percent or so of the shops out there fail then. To each there own however I guess...