Quoted from dmacy:It depends. If you tumble something that is zinc plated, it will take it off. If the ultrasonic gets things clean and shiny, than it's done. Screws just go right in the tumbler. If they don't come clean, I just use new screws.
I used a 30l Ultrasonic and two tumblers. A larger HF for the big stuff and smaller Cabela's for smaller stuff.
What are you using for an ultrasonic solution that keeps or makes the metal shiny?