- Any dish that is explicitly mentioned as NOT dishwasher-safe  - Knives: At high temperatures within the dishwasher can liquefy the cement that holds the two pieces of a hollow handled knife together - Cast iron should not go within the dishwasher - Pressure cooker tops - Little nourishment particles or dishwasher cleanser can collect or hold up within the controller or security valves.  - Plastic: high temperature can melt the plastics - Mud pots: they might just break