Unless you do not mind scratched dies, you need to clean the brass EVERY TIME. Brass can be cleanedd in a rotary rock tumbler, vibratory polisher, or with water and some sort of cleaning agent like Simple Green. Vibratory polishing is just the fastest and easiest way, not the only way.
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball