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Make a Baking Soda Paste
Next create a paste made of baking soda, water and a squirt or two of dish soap. Mix thoroughly until you have the consistency of mashed potatoes. Depending on your oven size, you may need to mix a second batch.
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Apply the Paste
Use a household sponge to cover the interior of your oven with the paste. Sides, back, floor and don’t forget the oven door. Make sure all area are covered, the thicker the better, especially on problem areas. Keep in mind where oven vents are located and either cover with painter’s tape prior or take special care to keep paste away from vents. Be careful when working around the oven light, it can get hot to the touch when the oven is left open for too long. Close the oven door and let sit overnight.