Leovet products, good or not?

I have got a shampoo from Leovet for white horses and what I really need in a Whitening shampoo is that cleans out all the yellow color in my stallion's mane after being outside all winter. I tried it and I really didn't get a lot of the color out. Are all the Leovet products this bad or not useful or do you like some products from them? Please tell comment and let me hear from you


( sorry if there is bad grammar, I'm from Iceland)