How to clean your oven (My Grandmama taught me)
Cleaning the Oven
Preheat oven at 200-degrees for 10-15 minutes.
Fill a 8x8 GLASS baking dish with Ammonia about an inch. Place the glass pan on the top shelf of the oven.
Now take a 9x13 GLASS baking dish and put it on the lower rack of your oven. Boil some water and put about an inch of boiling water into the 9x13 pan.