I have some experience washing Cremellos. I have always used Quic Silver shampoo. It is a bluing agent, much like the bluing stuff (that dark dark purpely blue stuff) you use after you bleach your hair. Same stuff. This will take out a LOT of discolor in your white horse, and make them silvery white. Like "take this horse out of the sun its so bright" white. It works on coats, manes and tails.
Quic Silver is expensive, but it really does work on those annoying poo stains. My instructor had a Cremello American Saddlebred that loves to never be white. Many poo and pee stains on her rump and sides, like she HAS to lay in her pee. Yuck. I know a lot of people at my barn pass around a bottle of Quic Silver to get socks and stockings clean and white on their chestnuts and bays. I have seen a couple palomino's too that it's worked on manes and tails.
Now, getting the deep yellow out of tails? Gojo hand cleaner is popular to do that with. I have no idea what is in it, but I know a lot of people with greys, cremellos, and paints who use it to take the discolor out of tails. You can research it across a lot of forums and youtube to see people use it. I have used Gojo once, and I cannot for the life of me remember if I liked how it turned out or not. Gojo is a hand cleaner used by automotive mechanics to take grease stains off of their hands.
Think of it not as a failure but as a success in how not to do it.
Don't look in a horses mouth for a gift.
Last edited by Joidigm; 08-10-2012 at 11:23 AM.