I wash mine and coat them with olive oil rubbing it in and then put them in a carton. The reason I do it is because I want to ensure they are clean and because of food borne illness and disease. I know there's alot of people that say they don't get sick but I am certified as a food manager and one thing you don't want coming in contact with any surfaces is feces. Whether it looks clean to the eye or not, it can still have bacteria that can get on to other things like your egg cartons, your utensils, your dishes, or hands without you realizing it and could make you sick. I coat it to mimick the natural coating and when I reach in to use it its already clean.