First you need white charolais not cream ones. Second some work: don't bed them with straw months before show and at the show, wood chips or outside is the best. We wash them each morning at the fair with soap dishes (palmolive), dry them with blower and the final touch we spray Sullivan's Zoom bloom.
Another important thing you need someone sit on a chair who watch and intervene before an animal sit in his poop and wash under the tail.