Photo from the web You can complete a deep oven clean using plain baking soda, water, and household white vinegar. This natural method lifts burnt grease without strong fumes, toxic sprays, or heavy scrubbing. You apply a thick paste, let it sit overnight, and wipe the dirt away the next morning. How to Clean the Oven Without Harsh Chemicals Step by Step To clean an empty standard oven, you need one cup of baking soda, half a cup of warm water, half a cup of white distilled vinegar in a spray bottle, and two clean microfiber cloths. Put on a pair of rubber gloves to protect your hands from dried grease and grime before you begin. Take out all oven racks, baking sheets, and thermometers so the inside of the appliance is completely empty. Mix the baking soda and warm water in a small bowl until it forms a thick paste, similar to the texture of toothpaste. If the paste feels too runny, add one more tablespoon of baking soda until it holds together on your fingers. Spread this mixtu...