Easy Off oven cleaner. Follow direction s on can
Cup of ammonia overnight set on rack
Preheat your oven to its lowest setting; once the light goes off, turn off stove. Put ammonia in a bowl or pan and let sit in the closed oven overnight. Remove the ammonia and add vinegar and soda to make a paste. Use the paste and a heavy duty sponge to scrub most stubborn areas. Mist the oven with water and wipe clean. This cleaner also works great for cleaning your barbecue grill.
Take off door,shelves,elements and drip pans and spray oven cleaner on them in your shower.lift up the stove top too