Clean a Filthy Oven with Baking Soda and Vinegar

Oven cleaning sits in that category of household tasks people avoid until the smell becomes undeniable. The commercial cleaners work fast, but they're caustic enough to wear gloves and crack windows—and they still leave a chemical residue that lingers. Baking soda and vinegar are gentler, cheaper, and they actually work better on heavy buildup because the paste stays put instead of running down hot surfaces. This method takes patience rather than elbow grease. You're going to let chemistry do the work while you sleep, then walk in the next morning to an oven that practically cleans itself.

1. Soak racks while you work. Pull out the oven racks and place them in your bathtub or a large plastic storage container filled with hot water and a few tablespoons of baking soda. This lets them soak while you work on the oven interior. If your tub is your only option, do this first thing so the water stays hot.
2. Clear loose debris first. Use a handheld vacuum or broom to remove loose crumbs, burnt food bits, and ash from the oven floor and shelves. Open the door wide and get into the corners. You're not going for spotless; just removing the loose stuff so your paste makes contact with the actual baked-on grime.
3. Mix the magic paste. In a glass or ceramic bowl, combine half a cup of baking soda with three tablespoons of water. Stir until you have a thick, spreadable paste. It should look like wet sand or cookie dough, not runny. Add water one teaspoon at a time if it's too thick; add more soda if it's too wet.
4. Coat every surface thick. Using a silicone spatula or old butter knife, spread the baking soda paste across every interior surface of the oven. Coat the bottom, sides, back wall, and the inside of the door. Avoid heating elements—work around them. You want a thick, even layer that covers all the dark, crusted areas. Don't be delicate; press it into corners and crevices.
5. Let chemistry work while you sleep. Close the oven door and walk away. Leave the paste undisturbed for 12 to 16 hours. The longer it sits, the more the baking soda breaks down carbon and grease. You can do this in the evening and deal with it the next morning, or overnight if you prefer.
6. Load the vinegar spray. Fill a spray bottle with white vinegar. Undiluted vinegar works best here. Set it within arm's reach of the oven. You'll use this to activate the baking soda paste and create the chemical reaction that lifts the remaining grime.
7. Trigger the fizz reaction. Open the oven door and spray the dried baking soda paste generously with vinegar. You'll see it start to fizz and bubble immediately. This reaction breaks down the remaining grime. Spray until the paste is saturated and the fizzing slows. You may need to use the entire bottle for a heavily soiled oven.
8. Wipe until spotless. Using damp microfiber cloths or old rags, wipe out the loosened paste and grime. Start at the top and work down so you're not pushing dirty water around. Rinse your cloths frequently. You may need several passes. Get into corners with a damp sponge or cloth wrapped around a wooden spoon. The paste should come away easily—if it doesn't, spray that area with vinegar again and wait five more minutes.
9. Shine the glass streak-free. Spray the interior glass of the oven door with vinegar and wipe it with crumpled newspaper. Newspaper doesn't leave lint like paper towels do. For stubborn spots, spray, let sit for a minute, then wipe. The glass should be clear without streaks.
10. Scrub racks with softened grime. Remove the racks from their soak. The buildup should have softened significantly. Use a stiff brush or old toothbrush to scrub away the remaining grime. For stubborn spots, make a fresh paste of baking soda and water and apply it directly to the rack, let sit five minutes, then scrub. Rinse thoroughly under running water.
11. Neutralize and dry completely. After you've wiped out most of the paste, spray the entire oven interior one more time with vinegar and do a final wipe-down with a clean, damp cloth. This removes any remaining baking soda residue and neutralizes any vinegar smell. Leave the door open for an hour to air dry completely.
12. Slide racks back home. Once the racks are completely dry, slide them back into their slots in the oven. Make sure they're seated properly and don't rattle. Close the oven door and run it at 200°F for 10 minutes to evaporate any lingering moisture and settle everything.