Has holiday cooking rendered your your kitchen oven "gooey"? Here's how to clean it without a lot of effort. To give your oven a good cleaning, pre-heat it to 200 F before going to bed. Then, put a bowl of ammonia on the center rack, close the door and leave the kitchen exhaust fan on low. Next morning you'll find the ammonia has softened crusty spills and they'll wipe up easily with a damp rag. To clean gooey oven racks and barbecue grills, put them in a plastic trash bag with ammonia, seal with a twist tie and let them soak overnight. Next morning wash them in the tub or hose them off. If you hate ammonia and live in warm weather, just leave them on the lawn overnight. Evening dew and enzymes in the grass will do the job. And that's the On The House tip for today.