First the coat sounds strange for this breed as I own and breed Andalusians. Was she clipped? Ouse two products that work well. Miracle Groom and WOW. WOW works to break up biological material and is also great on yellow tail and green or manure spots without washing. Wash and rinse tail, spray WOW and leave in. Voila overnight Miracle Groom works well, too without washing. Follow directions. Use your warm wet cloth solution to remove crusty stuff then deeper clean with MG.