The previous owners of our house never, and I mean never, cleaned the range hood. When we moved in, the metal filter was coated in a sticky amber layer that I honestly thought was some kind of factory coating. My wife touched it once and made a noise I can only describe as a full-body shudder.

Here is what I tried and here is what actually worked:

• Spray cleaner and a scrub brush? Ten minutes of effort, got maybe 40% off.
• Soaking in dish soap? Barely dented it.
• Boiling the filter in water with baking soda? Clean in two minutes with zero scrubbing.

The Boiling Method

Fill your biggest pot with water. Add about a quarter cup of baking soda. Bring it to a boil, then submerge the metal filter and let it boil for five minutes. The grease lifts off in sheets. You will see it floating on the surface of the water like some kind of industrial waste — which, technically, it kind of is.

Use tongs to pull the filter out. The metal will be hot. Rinse it under hot water and the remaining residue slides right off. If you have really old buildup, you might need a second boil, but I have not encountered a filter that survived two rounds without coming completely clean.

Why Baking Soda Works

Grease is acidic. Baking soda is alkaline. The alkaline breaks down the fatty acids in the grease through saponification — the same chemical reaction that makes soap. You are basically making soap out of your range hood grease. Gross but effective.

A note: this works on metal mesh filters. If your hood has a charcoal filter (common in recirculating hoods), those cannot be cleaned — just replace them. They are cheap and you should swap them every three to six months anyway.

Clean range hood, clean air, happy wife. Two minutes of boiling versus a lifetime of sticky regret.