Mix baking soda with a little water to form a thick paste
Remove oven racks and soak them in hot water with dish soap
Cover the oven interior with the baking soda paste, avoiding heating elements if possible
Spray white vinegar over the baking soda paste (it will fizz)
Let sit 30 minutes to overnight
Wipe away residue with a damp cloth or sponge
For stubborn spots, make a fresh paste, spot-apply, and let sit longer
Rinse by wiping with clean water, then dry with a towel
Clean the oven glass door with a baking soda paste, then wipe clean and dry
For grease buildup on the oven floor, sprinkle baking soda, spray vinegar, let sit, then wipe
To remove lingering odors, place a bowl of water with lemon slices in the oven at 250°F/120°C for 20–30 minutes, then wipe the interior dry