That's the same measure I use -- a not quite full 9mm case of Lemishine. I also make sure the water in the ultrasonic cleaner is hot and the lemishine is dissolved and no longer crystals at the bottom of the cleaner. Once I made those changes, I've had zero red/brown spotting from it. The brass does get truly shiny if it went in pretty clean to start and wasn't full of range dirt and debris (I always pick up brass when I go to the range and then sort it at home into definitely use/maybe use/scrap. The 'definitely use' gets cleaned. The other two collect in the garage.
