First, try rubbing some alcohol into the stains, then spray your couch with some distilled water. Scrub your couch until the water rings disappear. Finally, use the hard brush to fluff up all of the fabric.
To loosen old strands of hair, cut about every third row between the bristles. Stir some baking soda in hot water and place your brush in the solution. A couple of minutes later you’ll be able to easily remove all the hair from your favorite brush.