Wipe excess crumbs from the microwave interior. Fill a microwave-safe bowl with 1-2 cups water. Heat the water (in the microwave) to boiling, about 2-3 minutes. C arefully remove the bowl of hot water, then remove the tray from microwave and set aside. With a damp cloth, wipe the interior of the microwave. Wash tray in the sink with dish soap. Dry and return to microwave. For the exterior, spray with kitchen cleaner and wipe with paper towels.