I actually did but I called it a soap gun on @jeep_boss's paint thread.
I always start my wash with a pressure washer and then a foam gun and then a rinse. Then I hand wash and hand dry, then wax with Maguires paste wax and, aerospace 301 on the black parts. It is quite the adventure, but looks good when finishedView attachment 40160
My paint has too many scratches to go thru that much trouble. I might do that one a year, maybe.