Which items cannot be washed in the Maytag DW-1 dishwasher?

Items that cannot be washed include cast iron, pewter or tin, wooden items, and gold-plated flatware. Plastics should only be washed if marked 'dishwasher safe,' and antique or hand-painted china is not recommended. Crystal and silverplate can be washed with caution, but always check the manufacturer's recommendations first.