Right now, I am basically just leaving it alone, minus putting in some leave in condition in her tail, especially, when she gets alot of static. I usually braid and bag in the winter, but I need a new tail bag for her. Mane, I don't do a whole lot with, either, aside from the occasional leave in conditioner.
In the summer I tend to wash her fairly frequently, to get rid of the sweat from workouts. I don't always use shampoo, but always condition mane and tail when done rinsing her off.
"The ideal horseman has the courage of a lion, the patience of a saint, and the hands of a woman..."