I would just be interested in which Pre Cleaners you used or used. Which one did you find particularly good? Which ones were not good? Which one did you like best when you tested/used several? I use the DJ Lime Prime and am satisfied, just great paint smoothing after. Whether it increased the life of the wax (Collinite 915) I didn’t notice anything of it. However, I haven’t tried another Pre Cleaner yet. I might have wanted the Prima Amigo. Let’s go ahead and try it. MfG