High water temperature can damage your dinnerware, as can the corrosive alkalies, bleaches, and other chemicals in dishwasher detergents. Narrow-Necked Bottles Photo: istockphoto.com Although narrow-necked bottles can be upcycled for a number of DIY projects, you should never clean them in the dishwasher. Hand-Painted Glass and China Photo: istockphoto.com Neither the delicate hand-painted designs on the heirloom china your grandmother gave you as a wedding gift nor the gold filigree on your special-occasion dessert glasses can withstand the heat and harsh detergent of a dishwasher.