Which items should never be washed in the dishwasher?

Several items should not be washed in the dishwasher, including delicate and antique china, antique crystal, cast iron utensils, wooden items such as cutting boards and knives with wooden handles, gold flatware, and pewter or pewter-like materials. Cast iron will have its seasoning removed and will rust, while wooden items will crack, warp, or lose their finish.