No. More. Hardened. Brushes.
Ok lets address the elephant in the room. When dip powder comes in contact with dip liquids it hardens by its nature. This is where the importance of dusting off excess powder and washing hands after activating and buffing really come into play, so have no fear, it's mostly preventable but for when you do have this happen there's a quick fix!
Dip your brush into brush saver solution and wipe on a paper towel. The solution works instantly to dissolve any hardened powder on the brush and your brush will immediately be ready for use, good as new.