Ammonia vapor works great on burned on grease if the thing you are cleaning isn't damaged by it. Use it for my burner grates and drip pans, just put them in an

Ammonia vapor works great on burned on grease if the thing you are cleaning isn't damaged by it. Use it for my burner grates and drip pans, just put them in an enclosed container with some ammonia and let sit for a day or two.