Our makeup brush clean soap includes a special formula of moisturizing oils & butters that keep makeup brushes clean yet soft. Castor, coconut and olive oils. Packaged in a plastic container with a top. Instructions: Wet makeup brush thoroughly, run brush bristles over the soap bar while the bar is in the cup over and over. Rinse brush and repeat until brush is clean. Give your brush a final rinse to make sure all soap is removed.