For a natural oven cleaner, mix ¼ cup baking soda, 2 tbsp. salt and hot water so it becomes a paste. Let the paste sit for five minutes, then scrub your oven.  This will take a bit longer then a chemical spray but so much better for you and our environment.  Blissfully Clean stock baking soda in larger quantities than you’ll  get in your local shop and at a great price!!