As part of my makeup brush investments, I bought the benjabelle brush tree and this solid brush shampoo. I adore the lemon zest scent, and this hockey puck sized soap could not be easier to use. It's solid, so no worries about travelling with it (a la the beauty blender sometimes), and all you have to do is swirl your brush around, wash it out, and enjoy clean brushes. Ta Da!! Worth it, absolutely!