A cleanser to clean and condition brush fibres so that brushes last longer. Brand new in box. Full-size. (235 ml / 7.9 fl oz) Authentic. Cleansing, Conditions Brushes, Extends Brush Life M∙A∙C Brush Cleanser cleans and conditions brush fibres so that brushes will last longer. This makeup brush cleanser is convenient to use and is specifically designed to extend the life of high-quality brushes. It leaves your brushes smelling fresh and clean, and helps shorten their drying time.