Kitchen remodel in progress and just got Electrolux Icon Dual Fuel range installed. Used the griddle to make grilled cheese sandwiches. Some of the cheese melted onto the griddle and is very difficult to remove. How should I care for this griddle. I am not even sure what it is made of, I am assuming it is cast iron. Should I have seasoned it before using? None of these questions are answered in the use and care guide that came with the stove. Thanks for your help.