Oven hood filters are one of the most overlooked parts of a kitchen. Every time you cook, airborne grease and steam pass through the mesh above the hob, and over weeks the filter turns from a shiny metal grid into a sticky, yellow-brown panel that stops pulling air properly. The good news: with boiling water, baking soda and washing-up liquid you can restore most metal filters at home in under an hour.
This guide covers metal mesh filters (the removable aluminium or stainless-steel panels found in most cooker hoods). Charcoal / carbon filters are different — they cannot be washed and must be replaced according to the manufacturer's schedule.
Quick answer
Remove the metal filter, soak it in a sink of boiling water with a generous squeeze of washing-up liquid and 2–3 tablespoons of baking soda for 15–20 minutes, scrub gently with a soft brush, rinse in hot water and dry fully before refitting. Repeat every 1–3 months depending on how often you cook.
Why oven hood filters need regular cleaning
A clogged filter stops the extractor doing its job. Air, steam and grease are forced back into the kitchen instead of being pulled through, which means more condensation on walls, greasier cupboards near the hob and lingering cooking smells. A blocked filter also makes the fan work harder, which shortens the life of the motor.
- Reduces fire risk — built-up grease is flammable
- Improves extraction and reduces cooking smells
- Keeps nearby cupboards, tiles and walls cleaner for longer
- Extends the life of the extractor motor
- Important before property viewings, holiday-let changeovers or landlord check-outs
What you'll need
- A kettle of boiling water (or a sink deep enough to submerge the filter in hot water)
- Washing-up liquid (any degreasing brand)
- Baking soda (bicarbonate of soda) — 2 to 3 tablespoons
- A soft-bristle brush, old toothbrush or non-scratch sponge
- Rubber gloves and a clean tea towel or microfibre cloth
- Optional: white vinegar for a final rinse on stainless-steel filters
Step-by-step: cleaning a metal hood filter
1. Remove the filter safely
Switch the extractor off at the socket. Most filters release with a small spring clip or push-latch on the underside — press it and the panel drops into your hand. If it feels stuck, check the manual rather than forcing it; some models have two clips.
2. Boil the water and prepare the sink
Line the sink or a large basin so the filter can lie flat and be fully submerged. Pour in freshly boiled water, add a generous squeeze of washing-up liquid, then sprinkle in 2–3 tablespoons of baking soda. It will fizz briefly — that reaction helps lift grease out of the mesh.
3. Soak for 15–20 minutes
Lower the filter into the water and leave it. You'll see the water darken as grease releases. For heavily coated filters, top up with more boiling water halfway through to keep the temperature high — heat is what actually does the work.
4. Scrub gently
Wearing gloves, lift the filter out and work over the mesh in small circles with a soft brush or old toothbrush. Focus on the corners and any visibly greasy patches. Avoid wire wool or aggressive scourers — they scratch the aluminium and leave marks that trap grease faster next time.
5. Rinse and dry
Rinse under hot running water until it runs clear. Shake off excess water, pat dry with a clean tea towel and leave the filter to air-dry fully before refitting — a damp filter can drip onto the hob and encourages the next round of grease to stick faster.
Natural alternatives if you're out of baking soda
- White vinegar and hot water — good for lighter grease and stainless steel
- Lemon juice and washing-up liquid — mild, pleasant smell, works on newer buildup
- Dishwasher on a hot cycle — only if the manufacturer confirms the filter is dishwasher-safe (repeated cycles can dull aluminium)
How often should you clean it?
For a household that cooks most evenings, every 4–6 weeks keeps the filter in easy condition. Lighter cookers can stretch to every 2–3 months. Holiday lets and rental kitchens benefit from a filter check between guest stays, because a greasy hood is one of the first things new arrivals notice.
When home cleaning isn't enough
If the filter has been left for a year or more, the grease can turn hard and varnish-like — soaking alone won't shift it. The same is true if the extractor housing, ducting or fan blades behind the filter are coated, which is a common find on kitchens that have never had a professional deep clean.
In those cases a professional oven and extractor clean is usually faster and safer than repeated home attempts. CleanCo offers kitchen appliance cleaning across the Isle of Man, including hoods, filters, ovens, hobs and microwaves — useful before property sales, end-of-tenancy handovers or holiday-let changeovers.