In reply to sbaddy:
some who have used dishwashers have found that holds have tended to disintergrate(sp) over time and washes in said dishwasher....perhaps due to detergents used or residue from the machines?
i'd say invest in a pressure washer, waterproof overalls, wellies and some elbow grease
i've always cleaned this way, cold as it may be during colder months but does trick and method used by many climbing walls ala boulderuk and i think works