I'm assuming you don't have a self cleaning oven. I use Easy Off no fume.
Here are a collection of projects:
I wipe mine down each time there's a spill. If there's something bad, I soak with either marble paste or a degreaser (GP66 is my choice) and let sit a bit, then wipe or scrub if needed.
Hi, here's a great video that will show you how - https://www.youtube.com/watch?v=73OVlUSP_yM
How about this?