Turn off the oven and let it cool completely
Remove oven racks and any loose debris
Mix baking soda and water into a thick paste (for most surfaces)
Spread the baking soda paste over the inside surfaces (avoid heating elements if they are exposed)
Cover stubborn spots with a thicker layer of paste
Let the paste sit for 6–12 hours (or overnight)
Wipe away the paste with a damp cloth
Remove remaining residue with a plastic scraper or non-scratch sponge
Rinse with a clean damp cloth and wipe dry
Clean the oven door glass with a glass-safe cleaner or a vinegar-water solution
For grease-heavy areas, spray vinegar-water lightly after wiping (it should fizz slightly), then wipe clean
Clean the heating elements carefully with a damp cloth (do not soak)
Clean the racks separately by soaking in hot water with dish soap (and baking soda if needed) for 1–4 hours
Scrub racks with a non-scratch pad, rinse, and dry completely
For burnt-on spots that won’t lift, apply fresh baking soda paste and repeat the process
Dry all surfaces thoroughly before turning the oven back on
Optional: run the oven at a low temperature (about 250°F/120°C) for 10–15 minutes to help evaporate any remaining moisture