Effervescent brush cleaner Brush Therapy rids your brushes of dirt, debris, bacteria and fungi in just eight minutes. Dissolve the contents of the tube (1.78oz) in warm water. Trapped hairs loosen and comb out easily, leaving your brushes sparkling with a great citrus scent. Rinse thoroughly. Gently air-dry cleaned brushes. If your brushes have wide, thin wood backs (typically ovals) it is best to soak the bristles only in a shallow tray.