I can not and will not argue with the advise of not mixing the brass cleaning compound directly with the media and brass. After hearing the caution not to do so, it sounds logical.
I will say you should always check your brass before placing it in your press. I have had both walnut and corn cob media (without any additive brass cleaner) clog inside .380 brass.
So, thanks to those who corrected me. I am always willing to listen and learn.