One cleaner I use is to put orange peelings from 2 oranges in a jar and cover with vinegar. Let it set 5 days. The pour the liquid into a spray bottle. Put baking soda over the dirty area in the oven and spray it with the liquid. It will bubble and turn brown. Let it set ten minutes and wipe it off. Repeat as needed. Hope this helps, it works best to use before there is much spilled or built up in the oven.
Make a paste of Bakig Soda, use a sponge apply the baking soda paste inside your Oven leave it over night. The next day spray it with white Vinegar and wipe it with the sponge. In the future when you fill a fresh Orange save the sin of Orange in a Jar with water , you can use this same water as subtitude Vinegar. Happy Holidays!
If you Oven is not self cleaning, use a mixture of vinegar and baking soda and that should work you can add some lemon oil or lemon juice for extra grease cutting power. Simply make a paste in the consistency you want to keep wiping and rinse clean.
Here's what I do: