If this is an "au-natural" type class, I would think anything like powder, oil, etc is going to count against you...they will want to see how healthy and beautiful the horse is without all the 'extra' stuff.
Bathe him well, and brush him lots, maybe even rub him down with a soft cloth, then rug him the night before...the higher up the neck you can rug him the better, since you will want to touch up with sponge bathing the morning of. If you have a sleezy, use that on his head/neck to keep his mane flat. Make sure his mane has been pulled well, and is nice and even throughout. Same with his tail...make sure he is neatened up. Wash and condition both well; that's all you should need to do, to make those shine well. I would wash his tail the morning of, since I'm not sure they would want a crimpy tail, from it being braided. This will also ensure there is no dust in the tail from his night's rest, as well.
Other than just making sure he is squeaky clean, and well trimmed, I wouldn't do anything more...Make sure your halter is clean, and well fitted, obviously, but if it's a natural class, then leave him natural...not much more than that, plain and simple.
"The ideal horseman has the courage of a lion, the patience of a saint, and the hands of a woman..."
Last edited by mom2pride; 06-12-2011 at 07:52 PM.