Can someone explain to me what the bay brushes are? I’m not really understanding how brushes work for different colors. I have the Leistner version of the Schimmel I think (The coco fiber brush?) that came in my set and I really like it for getting dirt and manure stains off my sorrels. So I can kind of see how it would benefit a gray getting stains off. It seems to work well because it’s a fairly stiff brush with dense short bristles. Which is why I attributed it working so well. But why would my sorrel need a different brush than my (hypothetical, don’t currently have one lol) bay? Honestly curious!