Today I got on a cleaning kick and decided since I was having such success with my Hornaday 2L ultrasonic cleaner on gun parts, I would use it on my reloading dies. It didn't go well. I should have ran a test run before putting $500 worth of dies in the cleaner all at once. It took them from a nice shiny factory color to dull bare metal, which I assume will rust by morning. I was using the regular parts cleaner solution at the factory reccomended dilution level. I have dried them with pressurized air and sprayed a pretty liberal amount of oil on them until I figure out what to do next.