Gold as Sun is the Cheval brand supplement for palominos. A shiny horse is a healthy horse. Make sure your horse is on a well balanced diet and is groomed daily with lots of currying. As for whitening shampoos, I personally like quick silver and show bright, but most blue shampoos are pretty similar. The soap i think works the best though is Ivory soap, its 4 bucks at the grocery store haha. Its a dish soap do I dilute it a lot, but it is the best at removing stains. And the best thing for getting yellow out of a tail...vinnegar. Hands down. Soak it in some vinnegar, rinse it, and condition it. After a couple of times there will be no yellow.