Originally Posted by Azale1
Whitening shampoo and then keep it braided and bagged so it stays clean. Usually it takes a couple of treatments to get it really white.
With my gray mare, I leave her tail unbagged during the summer because I give her a bath about every week, so dirt/nasty-nast doesn't have time to really soak into the hair. But, in the winter, I'm very careful to never leave her tail unbagged for more than a few hours. Last winter I tried just braiding it and that helped it stay cleaner than if it was loose but it still got dirty and yellow/brown. This year, I've kept it bagged since September and it's still as white as it was when I put it up.
Last summer, it took me months to get all the yellow out, even with leaving whitening shampoo (I recommend QuicSilver, that stuff is magic on my mare's body, just not so much on her tail) in for over twenty minutes at a time. I think that it actually may have grown out instead of washing out.