A friend of mine swears by a product called Greased Lightening, that she swears is better than blue Dawn. I think it is available at lumber or dollar stores. The best degreaser on walls or cabinets that I have found is Trisodium Phosphate (granular) or Lowes has a similar product that is an orange liquid that is similar, right next to the granular version. If the hood is painted though, it may strip the paint. Wear rubber gloves, but there is not a chemical odor at all. I have used it for years to prepare walls to paint, or to wipe down the kitchen cabinets occasionally.