How It Works STILL CLEANSING BY HAND? THERE’S A LOT YOU’RE MISSING: In an independent clinical study, women applied fluorescent makeup to their forehead (to show residue under UV light). Using cleanser, they washed one side by hand and the other side using Mary Kay Skinvigorate Cleansing Brush for the same length of time. Afterward, the women were satisfied they had washed all of the makeup off and saw no color remaining on their forehead. The results below show under ultraviolet light that the Skinvigorate Cleansing Brush side is clearly cleaner. Provides deep cleansing, gentle exfoliation and massaging in one easy step.