Clean Range Hood Exterior and Ducting

Grease builds silently. Every dinner, every splatter, every high-heat sear sends a film upward that settles on your range hood exterior, clogs the mesh filters, and coats the inside of the ductwork like varnish. Most people wipe down the visible steel once a month and call it done. But the real work happens inside the filters and up in the first few feet of duct, where sticky residue chokes airflow and creates a genuine fire hazard. A proper range hood cleaning means taking apart what you can reach, dissolving what has hardened, and restoring the system to the airflow it had when new. This is not a weekly task. Twice a year is the standard for moderate cooking; quarterly if you sear meat often or cook with high heat daily. The work is straightforward but requires patience with degreaser dwell time and a willingness to scrub. Done well, your hood will pull smoke efficiently again, your kitchen will smell cleaner, and you will have eliminated one of the most common ignition points in residential fires. Take an afternoon, pull the filters, and see what a decade of dinners looks like.

1. Start by Removing the Filters. Turn off the range hood and let it cool completely if recently used. Most mesh or baffle filters slide out from underneath or pop free with a small tab release. Pull them down carefully and set them in the sink. Inspect for hardened grease buildup, warping, or corrosion. If the filters are aluminum baffle style, they are dishwasher-safe; if they are older mesh, they may require soaking.
2. Dissolve Grease with Heat. For baffle filters, run them through the dishwasher on the highest heat setting with a grease-cutting detergent. For mesh filters or heavily soiled baffles, fill the sink with hot water, add a half-cup of dish soap and a quarter-cup of baking soda, and submerge the filters for 20 minutes. Scrub with a nylon brush, rinse thoroughly, and let air-dry on a towel.
3. Polish the Visible Steel. Spray the outside of the hood, the underside, and the control panel area with a degreasing cleaner or a mix of equal parts white vinegar and water. Let it sit for two minutes, then wipe with a microfiber cloth. For stainless steel, wipe in the direction of the grain to avoid streaking. Repeat if necessary on areas with visible buildup.
4. Clean the Hidden Cavities. With the filters removed, shine a flashlight up into the hood interior. You should see the blower housing and the start of the ductwork. Wipe down any accessible interior surfaces with a degreaser-dampened cloth. Reach as far as you can into the duct opening and wipe the first few inches of duct interior, pulling out any loose grease or lint.
5. Extract Years of Lint Buildup. Attach a crevice or flexible hose attachment to a shop vacuum. Insert it into the duct opening and vacuum as far as the hose will reach, moving it in a circular pattern to pull out dust, grease particles, and lint. You will be amazed at what comes out. If the duct run is short and accessible from the attic or exterior vent, repeat from that end.
6. Free the Flapper Mechanism. Go outside and locate the vent termination cap on the exterior wall or roof. Remove the cover if possible and clean the louvers or flapper with a brush and degreaser. Check that the flapper moves freely. If it is stuck open or closed, it defeats the purpose of your hood. Replace if corroded or jammed beyond repair.
7. Verify Suction Returns. Reinstall the clean, dry filters by sliding them back into their slots until they click or seat firmly. Turn the range hood on to the highest setting. Hold a tissue or piece of paper near the filter; it should be pulled flat against the mesh, indicating strong suction. Listen for any rattling or unusual noise that suggests a loose part.
8. Lock in a Cleaning Schedule. Mark your calendar or set a recurring reminder for six months from now. Range hood cleaning is one of those tasks that falls off the radar until the hood stops working. Keeping it on a schedule prevents the truly disgusting buildup and keeps your kitchen safer.