Key takeaways
- Dishwasher on heated dry for aluminum mesh filters. Alkaline detergent and heat discolor and weaken aluminum. Stainless baffle filters tolerate the dishwasher; aluminum mesh should be hand soaked.
- Abrasive pads or powdered scrubs on stainless. They leave permanent scratches. Use degreaser and time instead of pressure.
- Spraying directly into the hood. Liquid reaches the motor, wiring, and light sockets.
- Oven cleaner or bleach. Both damage aluminum and can pit or discolor stainless.
- Reinstalling wet filters. Moisture plus grease equals a gummy layer that clogs faster.
- Ignoring the vent cap outside. A stuck damper on the exterior wall or roof cap chokes airflow no matter how clean the filter is.
A greasy range hood is more than ugly. The filter clogs, airflow drops by half or more, and the hood stops capturing smoke and steam, so the grease that used to land in the filter now coats your cabinets and ceiling. Worse, a saturated filter and a grease-lined duct are the fuel in a large share of kitchen fires. The usual cleaning mistakes are using an abrasive on brushed stainless, spraying degreaser into the fan housing where it reaches the motor, and running metal filters through a dishwasher on a heated dry cycle, which turns aluminum mesh dark and brittle. Done correctly, a full hood cleaning takes about an hour, most of it soaking time, and a maintenance wipe takes five minutes.
What You Need
| Item | Why | Optional? |
|---|---|---|
| Kitchen degreaser spray (22 to 32 oz bottle, $13 to $15) | Formulated to dissolve polymerized cooking grease without scratching | No |
| Baking soda (1/2 cup) and dish soap | Soak solution for filters; alkaline enough to lift grease | No |
| Sink, dishpan, or a baking sheet large enough for the filter | Holds the filter flat in hot water | No |
| Boiling or very hot water (3 to 4 quarts) | Melts grease so the soak works in minutes instead of hours | No |
| Soft-bristle brush and non-scratch sponge | Works grease out of mesh and baffles without bending them | No |
| Microfiber cloths (3 or more) | Wiping, rinsing, and streak-free drying | No |
| Nitrile gloves | Degreasers and hot alkaline water are hard on skin | Yes |
| Step stool | Working overhead at 66 to 72 inches with wet hands is safer from a stable platform | Yes |
| Stainless steel polish or a few drops of mineral oil | Restores the brushed finish and slows new grease adhesion | Yes |
| Flashlight | Inspects the fan blades and duct opening | Yes |
Step-by-Step
Step 1: Power down and remove the filters (5 minutes)
Switch off the hood and, if the lights or fan are on a wall switch, flip that too; unplug an over-the-range microwave hood or turn off its breaker. Most filters release with a spring tab or a slide latch; mesh filters on 30 inch hoods are typically about 10 by 12 inches, baffle filters on range hoods run 12 to 20 inches long. Note how they came out so they go back the same way. Lay a towel on the cooktop to protect it from drips.
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Step 2: Soak the filters (15 to 20 minutes)
Fill the sink or a baking sheet with the hottest water you can, add a quarter cup of baking soda and a generous squirt of dish soap, and submerge the filters flat. Grease liquefies above about 130 degrees Fahrenheit, so the hotter the better. After 10 minutes, scrub gently with the soft brush along the mesh or between the baffles, then let them soak another 5 to 10 minutes. For heavy buildup, spray degreaser directly on the filter before soaking.
Step 3: Rinse and dry the filters (10 minutes, plus air drying)
Rinse under hot running water until no suds remain and water runs clear through the mesh. Shake off excess and stand the filters on a towel to air dry completely, usually 30 to 60 minutes. Never reinstall damp filters; trapped moisture mixes with new grease into a sticky paste.
Step 4: Degrease the hood interior (10 minutes)
Spray degreaser onto a cloth, not directly into the hood, and wipe the underside, the filter frame, and the grease channel where the filters seat. Work in sections and let the product sit 30 to 60 seconds on thick spots. Follow with a cloth dampened in clean water, then dry. Keep liquid away from the fan opening, the light fixtures, and any control panel; those areas get a barely damp cloth only.
Step 5: Clean the fan blades and housing (5 to 10 minutes)
Shine a flashlight into the fan cavity. If the blades or blower wheel show a visible grease coat, wipe what you can reach with a degreaser-dampened cloth wrapped around a finger or a soft brush. Do not spray into the motor. Blades you cannot reach on a ducted hood are a job for the annual duct cleaning described below.
Step 6: Clean the exterior (5 minutes)
Wipe the outside with a cloth lightly sprayed with degreaser, moving with the grain on brushed stainless. Rinse with a damp cloth and buff dry. Finish with a few drops of stainless polish or mineral oil on a cloth, wiped thin; this restores the sheen and makes the next wipe-down easier. Reinstall the dry filters and run the fan for two minutes to confirm airflow.
Mistakes to Avoid
- Dishwasher on heated dry for aluminum mesh filters. Alkaline detergent and heat discolor and weaken aluminum. Stainless baffle filters tolerate the dishwasher; aluminum mesh should be hand soaked.
- Abrasive pads or powdered scrubs on stainless. They leave permanent scratches. Use degreaser and time instead of pressure.
- Spraying directly into the hood. Liquid reaches the motor, wiring, and light sockets.
- Oven cleaner or bleach. Both damage aluminum and can pit or discolor stainless.
- Reinstalling wet filters. Moisture plus grease equals a gummy layer that clogs faster.
- Ignoring the vent cap outside. A stuck damper on the exterior wall or roof cap chokes airflow no matter how clean the filter is.
How Often
Wipe the exterior and underside weekly with a damp microfiber cloth; two minutes prevents the buildup that requires a full session. Clean the filters monthly if you fry or sear several times a week, every two to three months for lighter cooking, and give the interior and fan housing the full treatment every three months. Replace charcoal filters in ductless hoods every three to six months; they cannot be washed. Inspect ductwork and the exterior damper yearly. If you install a new hood in 2026, start these habits on day one; a filter that has never saturated is far easier to keep clean than one being rescued.
When to Call a Pro or Replace
Call a duct cleaning or appliance service if grease has migrated past the filter into the duct run, if the fan is louder or weaker after cleaning, or if grease drips from a duct joint; residential hood and duct cleaning runs $150 to $400. Replace mesh filters when the aluminum has darkened, torn, or bent so it no longer seats flat; replacements cost $15 to $40. Replace the hood if the motor hums but the blower does not spin, if the housing is corroded, or if it is rated under 200 cubic feet per minute over a gas range; a basic 30 inch under-cabinet hood starts around $100 to $200, and 300 to 600 cubic feet per minute is the effective range for gas.
FAQ
Can I put range hood filters in the dishwasher?
Stainless steel baffle filters, yes, on a normal cycle without heated dry. Aluminum mesh filters, no; they discolor and weaken. Hand soak those in hot water with baking soda and dish soap for 15 to 20 minutes instead.
What dissolves hardened, sticky range hood grease?
Heat plus alkali. Hot water above 130 degrees with baking soda, or a purpose-made kitchen degreaser left to sit for a minute, softens polymerized grease so it wipes away. Avoid solvents and abrasives, which damage the finish.
How do I know my filter is too dirty?
Hold it up to a light. If you cannot see light through most of the mesh, or a paper towel pressed to it comes away oily, it needs cleaning. Reduced suction and a hood that smells of old oil are the other signs.
Does a greasy range hood cause fires?
It raises the risk. Grease in a filter or duct ignites at roughly 600 degrees Fahrenheit, a temperature a flare-up on a gas burner can reach. Regular filter cleaning and an annual duct inspection are the standard precautions.
