Your family's traditional recipe for mouth-watering spaghetti sauce was passed down to you from your mother, who got it from her mother, who got it from her grandmother. Too bad it didn't come with instructions on preventing the stubborn red staining that the sauce leaves in your plastic food-storage containers.
Now you can teach your mom a thing or two. Before storing any kind of tomato-based food or sauce in a plastic container, rub the inside of the container with vegetable oil to form a protective barrier against stains. Applying a thin coating of vegetable-oil cooking spray will work, too.