Brushdoc Cleansing OilOur revolutionary Brushdoc cleansing oil cleans your brushes and sponges like no other. Add a small amount of cleansing oil to your makeup brushes or sponges before placing into the Brushdoc device, and watch the oil emulsify with the water and melt away any stubborn makeup. The cleansing oil is specially designed so that it doesnt leave any oily residue, and also kills bacteria thanks to the tea tree oil infused into the cleanser.