tail grooming

Okay, so my horses tail is STUNNING from the bottom of the tail bone, down to the very bottom. But on his tail bone, he used to rub. Creating this ugly short hair looking thing. It kind of looks like a tail mullet, now that I think about it. He has stopped rubbing it and there is no bald patches...

Do you have a horse with a dark colored Mane and Tail? (e.g, black, brown) Does this horse have dandruff on his Mane/Tail? If your answer is yes, than you probably have tried everything to get rid of it. Well I have your solution right here and its very economical. Wash your horse's Mane or...