I was just told by a farrier to use Tomorrow – it is used for mastitis in cows. It comes in a tube like dewormer. (http://www.bi-vetmedica.com/species/cattle/products/ToMorrow.html) Use cotton, put Tomorrow in the sulcus, pack in some cotton and leave it. It will grow out with the healthy hoof.
Then use spray on Thrush Ender (www.silvetrasol.com).