Green cleaning the oven and stove top

I use my oven a lot, probably five times a week on average. Everything goes in there - bread, scones, cakes, biscuits, pies, quiches, roast chicken, leg of lamb, pork shoulder, meatloaf - all cooked from scratch and all baked in my trusty, and sometimes crusty, oven.  I cleaned it out about two months ago when it was very dirty after a winter of casseroles and roasts. This time it wasn't so bad