Gordon setter grooming - Full pet groom Part 1 - Pre-bath preparation

Which part of grooming are better to do before the bath and why
Stripping the head - how to use Mars coat king ( 12 teeth ) and why is it good to use on the setter head even in reverse
Using comb with rubber bands to comb out the dead coat on the body
Some hand-stripping and carding
Rewarding a good grooming behaviour