I really wouldn't be putting any non-proprietary acid/alkaline cleaner near my brass. Brass is a soft metal and corrodes rapidly in the presence of any acid or alkaline. Even weak organic acids like citric will pit the brass and weaken the case. Take care.
I always use corn media and add a small amount of Autoglym polish to the media before tumbling. Leave them overnight in the vibratory cleaner. Nice and shiny.