Three products, three different approaches, and no shortage of confusing marketing claims. Here's the honest version: each one works, but for different situations. Buy the wrong type and you'll think none of them work.
Quick answer
| Situation | Best choice | Why |
|---|---|---|
| Ongoing passive protection | Charcoal bag | Sits there, adsorbs VOCs 24/7, no power needed |
| Immediate fix after cooking | Enzymatic spray | Breaks down residue on surfaces within minutes |
| All-day background odour control | Plug-in | Continuous fragrance release with some trapping |
| Strong smell that won't shift | ONA gel | Professional-grade, neutralises airborne compounds |
If you already know which type you want and just need a specific product, our buying guide has the picks.
Activated charcoal bags
Charcoal bags use adsorption. The bamboo or coconut shell charcoal inside has millions of microscopic pores that trap volatile organic compound molecules as air passes through. Nothing is sprayed, burned, or plugged in. You place the bag, it sits there, and it works.
Strengths:
- No running costs, no power, no refills
- Lasts one to two years with monthly sunlight reactivation
- Works 24/7 without you doing anything
- No fragrance — actually removes smell rather than adding another one
- Cheap over its lifetime (£10-14 for a year or more of use)
Weaknesses:
- Slow. Takes hours to have a noticeable effect
- Won't rescue you after a fry-up. By the time it's made a dent, you've already been smelling it for half the evening
- Hard to tell when it's spent. There's no indicator — you just notice it's stopped working
- Effectiveness depends heavily on placement and room size. One bag in a large open-plan kitchen won't do much
Best for: Daily cooks who want a set-and-forget baseline. Put bags near the hob, on top of cabinets, and in adjacent rooms. Think of them as maintenance, not emergency response.
Enzymatic sprays
Enzymatic cleaners use biological enzymes (protease, lipase, amylase) to catalyse the breakdown of organic molecules on surfaces. Cooking deposits proteins, fats, and carbohydrates on your hob, worktops, and splashback. These deposits off-gas and produce the lingering smell. The spray destroys them.
Strengths:
- Fast. Spray, wait a minute, wipe. Smell source is gone
- Actually destroys the odour-causing compounds, not just covering them
- Works on soft surfaces too — spray cushion covers, curtains, upholstery
- Available as unscented formulas
Weaknesses:
- Only works on surfaces. If the smell is already in the air, you need something else for the airborne part
- Consumable — you use it up and buy more
- Not cheap per use if you're spraying down the whole kitchen daily
- Doesn't help with prevention. It's a reactive fix
Best for: Post-cooking cleanup. Fried fish? Curry? Spray the surfaces within 30 minutes of cooking. The sooner you get to it, the less time the residue has to off-gas into the rest of the house.
Fish smell is the hardest cooking odour to shift — we've written a specific guide for that.
Plug-in odour eliminators
Most plug-ins are just automated air fresheners. They heat a scented liquid or gel and release fragrance continuously. The smell from your cooking is still there; you just can't detect it past the manufactured scent.
Febreze is the exception, sort of. Their plug-in uses beta-cyclodextrin, a ring-shaped molecule derived from corn starch that physically encapsulates some odour molecules so they can't reach your nose. It's a real mechanism, not just fragrance. But the encapsulation is reversible (the molecules aren't destroyed), and modern Febreze also contains added fragrance. So you're getting partial trapping plus partial masking.
Strengths:
- Always on. No action required
- Consistent. Keeps the room smelling pleasant all day
- Widely available. Every supermarket stocks them
- Febreze's cyclodextrin does have a real odour-trapping component
Weaknesses:
- Most plug-ins are pure masking. Read the ingredients — if it's just fragrance and propellant, it's an air freshener, not an eliminator
- Even Febreze only encapsulates, doesn't destroy. The molecules stay; they're just temporarily trapped
- Ongoing cost. Refills every few weeks
- Can trigger headaches or sensitivities in some people
- Will not cope with a serious post-cooking smell. A plug-in vs post-curry kitchen is not a fair fight
Best for: Households where someone cooks light meals daily and wants the kitchen to smell generally pleasant. Not for heavy cooking odour.
What about ONA gel?
ONA deserves a mention even though it doesn't fit neatly into the three categories above. It's a gel made with essential oils that react with airborne volatile compounds and neutralise them. Not mask. Not trap. Chemically react.
It was developed for commercial odour control — waste processing, food manufacturing, that sort of thing. You open the tub, leave it in the room, close it when the smell's gone. A single tub lasts weeks of intermittent use.
When to use it: After charcoal and sprays have done their bit and the smell is still there. Or when you've cooked something particularly aggressive (fish, strong curry, burned food) and need something that actually attacks the airborne compounds rather than waiting for them to settle.
When not to use it: Continuously. It's strong. Don't leave it open overnight in a small kitchen or you'll overpower the room with ONA's own scent.
Our recommendation by situation
"I cook every day and want my kitchen to smell clean" Charcoal bags (ongoing) + enzymatic spray (after cooking). This combination handles both the ambient and the post-cooking smell. The charcoal works in the background; the spray deals with the surface deposits. Cost: about £25 upfront, then £10-15 every few months for spray refills.
"I've just cooked fish/curry and the house stinks" Enzymatic spray on all surfaces immediately. If it's still bad after an hour, open the ONA gel for two to four hours. Ventilate throughout.
"I want something I don't have to think about" Febreze plug-in. It won't eliminate strong smells but it keeps the kitchen smelling acceptable between cooks. Just know you're mostly masking, with a small amount of trapping.
"Nothing is working" Check your extractor fan filter. If it's a recirculating hood, a spent carbon filter means zero odour removal. A £10 replacement filter might solve what no spray or charcoal bag can.
For the full guide covering all cooking smell fixes, start here.
Prices checked April 2026. Prices may vary.
