Pour 1/2 cup of ammonia into a small bowl and place in over overnight. In the morning, wipe off grease with a rag or paper towel.
TIPS: Always label your container with the ingredients. I write out the recipe and tape it to the side of the jug. This way, if accidental ingestion were to happen, Poison Control would know exactly what was in it and how much. ALWAYS keep cleaners out of the reach of children.