I tried the RCBS Liquid cleaner in my Lyman Duo last night. It does a great job of getting the brass REALLY shiny, but the acid smell is rather unpleasant if you get your nose right over it.
It also had a huge clump of "goo" floating on the water when I did my first load of brass. The second load had a lower amount of the case cleaner liquid in it and did not leave the "goo".