I am from out in Cali and we have lots of replacement heifer shows out here and run into the same problem. Out here a replacement heifer show is where they show short-bred heifers and then sell them, in a replacement heifer auction. They are not looking for show cattle just like your fair said...
Well my routine:
Rinse Twice a day and brush brush brush! You cant get hair on one unless you brush them! Even if you have a cold box brushing is the key!
Then I "dip" them with Kleen Sheen, Fly Spray, Vinegar, and Mouth Wash (Mouth Wash is to keep them from getting ringworm if you are...