A range hood filter is doing its job precisely when it looks disgusting. Its whole purpose is to catch grease before it reaches the blower and the ductwork, so a brown, tacky filter is a sign the system is working — not that something has gone wrong. What has gone wrong is leaving it there. A clogged filter cuts airflow, weakens suction, lets cooking odours linger, and leaves a layer of trapped grease sitting above your hob, which is a genuine fire risk Range Hood Store.
The good news: this is a 20-minute job with three things you already own. Here’s the full method.
What You’ll Need
- Very hot or boiling water
- A degreasing dish soap (Dawn is the usual reference point)
- Baking soda — about ¼ cup
- A non-abrasive scrub brush
- Paper towels or a clean cloth
- A sink or a basin large enough to fully submerge the filter
[Photo slot: greasy filter still fitted under the hood, shot from below]
Avoid steel wool, scouring pads and harsh caustic cleaners. They scratch the aluminium or stainless surface, and a scratched filter traps grease faster next time Range Hood Store.
Step 1: Switch Off and Let It Cool
Turn the hood off and wait until it’s completely cool to the touch before you put a hand anywhere near it Range Hood Store. This is a two-second step that people skip, and it’s the one that prevents burns.
Step 2: Remove the Filter
Most filters slide or pop out of the underside of the hood. On many models there’s a small metal loop or latch you push up and slide sideways; on others the filter simply lifts out of a frame. Work gently and keep the filter level — a loaded mesh filter will drip.
[Photo slot: hands releasing the filter latch, close crop]
Step 3: Fill the Sink With the Hottest Water You Can Get
Hotter water does more of the work than any product. If your tap doesn’t run properly hot, boil a kettle and pour it in — that’s the approach The Kitchn’s testers use, and it’s why their method works on filters that have never been cleaned The Kitchn.
Step 4: Add Dish Soap and Baking Soda
A good squirt of degreasing dish soap plus about ¼ cup of baking soda. Swish it around with the brush until the water is properly soapy and slightly cloudy The Kitchn. The dish soap breaks the grease; the baking soda gives you gentle abrasive action and helps lift the tacky film without scratching.
Step 5: Submerge and Soak for 10–15 Minutes
The filter must be fully covered — any part sticking out of the water stays greasy. Ten minutes is the standard; go to 15 for a filter that hasn’t been done in a year Range Hood Store.
[Photo slot: filter submerged in a sink, water visibly discolouring]
Step 6: Scrub
Take the non-abrasive brush and scrub both faces, working along the grain of the mesh rather than across it. Add more dish soap directly to the brush if it’s still dragging. On a heavily soiled filter, most of the grease lifts in sheets at this point — The Kitchn’s readers report filters coming out “as good as new” with barely any scrubbing after a proper soak The Kitchn.
Step 7: Rinse in Hot Water
Rinse thoroughly under hot running water, both directions, until the water runs clear and the filter feels squeaky rather than slick. Warm or cold rinse water will leave a film.
Step 8: Dry Completely Before Reinstalling
Air-dry or pat dry with a cloth, then let it sit until it’s genuinely dry. Reinstalling a damp filter reduces efficiency and gives grease something to bond to immediately Range Hood Store.
Step 9: Wipe the Hood While You’re In There
With the filter out, you have access to the interior of the hood — the one place grease accumulates unseen and eventually drips back onto the hob. Wipe it down with a degreaser or warm water and mild detergent, and finish stainless with a proper stainless cleaner to avoid streaks Range Hood Store. Then refit the filter, check it’s seated flat with no gaps or rattle, and run the fan for a minute.
Know Your Filter Before You Start
Not every filter in a range hood is washable, and treating the wrong type this way ruins it.
| Filter type | Where you find it | Wash or replace? | Best method |
|---|---|---|---|
| Aluminum mesh | Ducted and ductless hoods, most common in homes | Wash | Soak in hot water + degreasing soap + baking soda |
| Baffle (stainless) | Ducted hoods, pro-style and high-CFM units | Wash | Dishwasher-safe on most models |
| Hybrid baffle-mesh | Ducted hoods | Wash | Soak, like mesh |
| Panel | Ducted hoods | Wash | Manual wipe, or the hood’s auto-clean cycle |
| Charcoal / carbon | Ductless, recirculating hoods only | Replace — never wash | New filter |
Charcoal filters absorb odours rather than trapping grease on a surface, so washing them does nothing except make a mess; they must be swapped out once saturated Range Hood Store. If your hood doesn’t vent outside, you almost certainly have one, and it’s usually behind or alongside a mesh pre-filter that is washable Hauslane. Check the manual for the replacement interval — typically every few months depending on how much you cook.
Baffle filters are the easiest of the lot: the angled stainless channels rinse clean fast, and most are dishwasher-safe, so a normal or heavy-duty cycle handles them Victory Range Hoods. Mesh filters are the opposite — layers of fine screen clog much faster, need soaking to clear grease out of the weave, and dry out into a hard bonded layer if you leave them too long Victory Range Hoods.
Can You Put It in the Dishwasher?
Sometimes — and only if the manufacturer says so. Many stainless and aluminium filters, including most baffle filters, are dishwasher-safe: place them upright on the bottom rack, run a hot cycle with standard detergent, and skip the heated drying cycle, which can warp the frame Range Hood Store.
Two caveats worth knowing:
Aluminium can discolour slightly after dishwasher cycles. It’s cosmetic and doesn’t affect performance Range Hood Store. But on mesh filters specifically, repeated hot cycles plus harsh detergent can dull the metal finish faster than on solid baffle panels, so check your model’s manual first Victory Range Hoods.
And don’t use the dishwasher as a shortcut on a filter that’s never been cleaned. You’ll push a large volume of grease into your machine’s plumbing. Soak it by hand first, then let the dishwasher do maintenance cycles from there The Kitchn.
The Overnight Rescue for Years of Baked-On Grease
If the filter is beyond a soak — hard, dark, and lacquered with polymerised fat — the sealed-bag ammonia method is the one people reach for. You put the filter in a heavy plastic bag, add a small amount of household ammonia, seal it, leave it overnight, and wipe the softened grease off the next day. It’s the same trick used on burner grates and oven racks, and it works because the fumes do the work instead of mechanical scrubbing.
Non-negotiable safety rules if you do this:
- Never mix ammonia with bleach. The combination produces chloramine gas, which is genuinely dangerous. Rinse the filter and the sink thoroughly if either has been used.
- Do it outside or in a well-ventilated space, and don’t lean over the bag when you open it. Ammonia fumes are harsh on eyes and lungs.
- Wear gloves, and don’t use it on aluminium if you can avoid it — ammonia attacks aluminium over long exposure.
- Keep it away from children and pets, and never in a closed cupboard.
If you’d rather not handle ammonia at all, repeat the boiling-water soak two or three times with fresh water and a longer dwell, and use a plastic scraper on the softened patches. It takes longer but it’s harmless.
How Often Should You Clean It?
- Every 1–3 months for most households Range Hood Store
- Monthly or more if you fry often, cook with a wok, or use the hob daily — and weekly-ish for a fine mesh filter The Kitchn
- Every 1–2 weeks for baffle filters in a heavy-cooking kitchen, since they’re dishwasher-safe and there’s no excuse Victory Range Hoods
- Every ~6 months if you barely cook The Kitchn
- Always after a big cooking event — a dinner party, a holiday roast, a batch of frying The Kitchn
The practical trigger is visual and tactile: run a finger along the underside of the filter. If it comes away tacky rather than nearly clean, it’s due.
FAQ
Can I just use vinegar instead? Vinegar does cut grease — one manufacturer recommends soaking mesh filters in it Hauslane — but don’t mix vinegar and baking soda expecting a stronger result. They neutralise each other, so you lose most of the degreasing benefit of both. Pick one: baking soda plus dish soap for a greasy filter, vinegar for a rinse and deodorise.
How do I stop the grease going down my drain? Wipe the worst of it off with paper towels and bin them before you soak. A sink full of grease water will set as it cools and clog the trap.
My filter still looks dull after cleaning — is it ruined? Probably not. Some dulling is normal with age and with dishwasher cycles, and discolouration doesn’t affect performance Range Hood Store. Replace it if the mesh is bent, torn, or a hole has opened up — a damaged filter lets grease straight through to the blower.
How do I know which filter I have? Look at it. Mesh is a fine woven grid, usually aluminium, often two layers. Baffle is a set of angled, chunky stainless slats with visible channels and a drip tray behind. Charcoal is a dark, felt-like panel in a frame, and only appears in hoods that recirculate.
Does a clean filter really change anything? Yes, measurably. Clogged filters reduce airflow and suction, force the motor to work harder, and leave odours and grease in the room instead of sending them outside Range Hood Store. Cleaning is also far cheaper than replacing filters or a blower motor.
Can I clean it with oven cleaner? No. Caustic oven cleaners can pit and darken aluminium and strip the finish off stainless. Stick to dish soap, baking soda and hot water, and use ammonia only as the last-resort overnight method with the precautions above.
The Bottom Line
The method that works is boringly simple: hottest water you can get, a squirt of degreasing dish soap, a quarter cup of baking soda, ten minutes of soaking, a soft brush, a hot rinse, and full drying. Do it monthly if you cook daily, and the filter never gets bad enough to need anything stronger. Check whether you’re looking at mesh, baffle or charcoal before you begin — charcoal gets replaced, never washed — and confirm dishwasher suitability in your model’s manual before you hand the job over to the machine. Twenty minutes every few weeks buys you better suction, cleaner air, and one less grease fire waiting to happen above the hob.