My brass gets tumbled every time I shoot it. Getting the dirt off saves the dies.
For grungy range pickup stuff the procedure is more involved. I deprime 45 cases with a 44 Mag expander die with a decapper pin (the die is big enough so the brass isn't resized.) Then I boil them in a water / salt / vinegar solution to get the crud out. Rinse, dry, inspect, the they go into the "to be tumbled" bucket along with my regular brass.