Why hood filters matter more than people think
Extraction filters trap airborne fat so it doesn't coat your ceiling, cabinets and light fixtures. Once a filter is saturated, it stops trapping efficiently, airflow drops noticeably, and the accumulated grease sits directly above an open flame or heating element. Most manufacturers recommend degreasing filters every one to three months depending on how much you cook — more often if you fry regularly.
Cleaning filters and the hood canopy
- 1
Cool the surface and clear loose debris
Make sure the range hood is completely cool to the touch and brush or wipe away loose crumbs and ash so the foam reaches the grease itself.
- 2
Spray an even coat of GreaseKiller™
Hold the bottle 4–6 inches away and cover the greasy area with a thin, even layer of foam. Don't flood it — the foam is designed to cling and work.
- 3
Wait about two minutes
The formula gets under carbonised grease and breaks its bond with the metal. Heavy, long-neglected build-up may need 4–5 minutes or a second coat.
- 4
Wipe with a damp cloth
Wipe in one direction with a damp microfibre cloth or paper towel. A soft brush helps on textured cast iron. Rinse afterwards and dry.
Baffle filters vs mesh filters
Baffle filters (the metal-slat kind) handle spray-and-wipe well: lay flat, spray both sides, let the two-minute dwell loosen the grease between the slats, then rinse under warm water and wipe dry. Mesh filters trap grease deeper in the weave, so a longer four-to-five-minute dwell and a soft brush worked into the mesh gets better results than wiping alone.
Don't forget these spots
- The underside canopy where the filter sits — often the greasiest surface in the kitchen
- The fan housing rim you can reach with a cloth (never remove the fan cover or spray into the motor)
- The stainless front, wiped with the grain to avoid streaks
- Cabinet doors directly beside the hood — they collect the same aerosolised film
Time, cost and risk compared
Every method below removes grease eventually. The difference is how long it takes, what it costs per clean, and how much of your surface finish it takes with it.
| Method | Hands-on time | Cost per clean | Risk to finish |
|---|---|---|---|
| Boiling water + dish soap bath | 20–30 min + drying | ~$0.05/clean | Low, but slow and hard to fit large filters |
| Degreaser tablets in dishwasher | 60–90 min cycle | ~$0.80/clean | Low, but not all filters are dishwasher-rated |
| Ammonia soak | Overnight | ~$0.30/clean | Medium — fumes, needs ventilation |
| GreaseKiller™ spray | 2–5 min dwell + rinse | ~$1.30/clean (3-pack) | Low — fast, no soaking required |
Where to be careful
- Never spray into the fan motor housing or electrical connections — unplug the hood first if you're working near them
- Charcoal/carbon filter cartridges (ductless hoods) aren't washable — replace them on schedule instead
- Unsealed wood range hood surrounds should be spot-tested, not soaked
- Let filters dry fully before refitting; damp filters restrict airflow just like clogged ones
How we tested this
Everything below comes from bench runs on 18 range hood filters, mesh and baffle styles rather than marketing copy. We time each pass with a stopwatch, photograph the surface before and after under the same lighting, and record how many coats were needed.
- Filters pulled from active kitchens with 1–4 months of build-up, not lab-simulated grease
- Dwell compared at 2 minutes (light film) and 5 minutes (saturated mesh)
- Airflow checked qualitatively before and after with a simple tissue-lift test
- Rinse water clarity photographed to gauge how much residue actually released
How many bottles do you actually need?
One bottle covers roughly 12–15 full cleans. Most people underbuy, run out mid-job and pay shipping twice — the multi-packs exist to avoid that, and the per-bottle price drops sharply as the pack grows.
| Your situation | Recommended pack | Price per bottle |
|---|---|---|
| Occasional cook, ductless hood | 2-pack | $16 |
| Daily cooking, ducted hood with baffle filters | 3-pack | $13 |
| Heavy frying, restaurant-style hood at home | 5-pack | $11 |
What customers say
“Our extractor filters were dripping-grease bad. I sprayed, walked away for five minutes, and the rinse water that came off them was almost black — but the filters looked new after.”
Try GreaseKiller™ risk-free
Bundles start at $9 a bottle with free worldwide shipping and a 90-day results-or-refund guarantee. Checkout takes under a minute.
Get 50% Off Now
