To make your own oven cleaner, you can buy one or even make it at home. All you need is some baking soda and liquid dish soap. Mix the two ingredients in equal parts and use a small brush or sponge to apply it to the inside of your oven. Allow it to sit for 15 minutes to work. Rinse the oven with distilled white vinegar to remove any remaining paste. This method is a cost-effective way to clean your oven.