mr.gale-
at no rinse. that's basically all i use on my Z and G these days.
mr.happy- for my dd's i dont use foaming guns because i usually dont have the luxury to choose when i wash the car. i wash them on a sat or sun morning regardless of shade or in the sun. with any type of gun on the hose it's just a pita to switch modes to quickly rinse off soap. the panel only has a few min before the sun starts to evaporate the suds into soap stains.
i only wash a section of the car at a time due to this.
i have no soap or water stains on my dd's after wash even in the sun. why? speed, technique, and right tools. and all i use are basic tools..griot's car wash, griot's wash bucket with casters, wash mitt, prima hydro, and waffle weave mf towels). no high tech tools needed.