Combine the ingredients, make sure that you pour the vinegar on the bicarbonate of soda slowly, otherwise, you will get a bit of a science experiment mess.
Slather on the paste into the oven. Get all sides, including the window.
Set it and forget it. Let it soak for a few hours.
Using a sponge, scrub where some of the deep scorches/ messes exist.
Using a kitchen wash-cloth, wipe out all cleanser until gone.