1. Empty the oven completely, setting any trays, racks, and oven dishes aside.
2. Mix 7 tablespoons of baking soda and four tablespoons of water until you have a spreadable cleaning paste.
3. Pour 200ml of vinegar into a spray bottle. With a spatula, scrape out any crumbs or burnt bits of food in the oven.
4. Coat the inside of your oven with the paste and leave it overnight.
5. Wipe up the baking soda paste and spray the inside of the oven surfaces with vinegar.
6. Take a damp dishcloth and wipe down any remaining foamy areas of the oven. Spray and wipe away the vinegar until your oven looks as clean as new.