INTERIORS
The car looked perfect and by Friday it smelled the same
Odour work is the only job a client can fail you on by smell — a week later, in a car that still looks flawless.
By Telmo Antunes · Published August 18, 2026 · 3 min read
Everyone has had this car. It left the studio spotless and came back the next week with the same complaint.
The job that comes back
The cleaning was done properly. The problem is that the smell was never visible, and what got treated was what could be seen.
A recovered interior is judged with your nose, days later, in a car left closed in the sun. That is the test that counts.
Why treating the air never works
Smoke does not hang in the cabin waiting to be neutralised. It settles and holds onto the porous materials: fabric, foam, carpet, the headliner.
Anything that treats only the air buys you a result that lasts as long as the product does. The source is still there, and heat and humidity bring it back.
The headliner holds the most, and ruins the fastest
The headliner is a large surface, permanently exposed to smoke rising, and one of the heaviest holders in the car.
It is also the easiest to destroy. It is bonded to a substrate, and soaking it lifts that bond: staining, creasing, or a liner that starts to sag. Work it with as little moisture as you can and no pressure — it is not a surface to extract the way you extract a seat.
Foam, carpet and the extraction that decides the result
In seats and carpet the smell is not only in the fabric: it is in the foam underneath. A surface clean hands back clean fabric sitting on foam that still smells.
Extraction is what makes the difference — pulling back out what you put in, rather than leaving the material saturated. An interior left damp for too long trades one odour problem for another.
The cabin filter and the ducts
This is where the smell you thought you removed comes back from. The cabin filter has spent months catching smoke, and if it stays in the car it re-contaminates the interior the moment the fan runs.
Replacing it is part of the job, not an upsell. The ventilation ducts hold odour too, and an interior treated with the air system untouched is a job half done.
Enzymes or fragrance?
They are different things and it matters which one you have just sold. An enzyme treatment works on the organic matter producing the smell. A fragrance covers it.
Covering has its place — at the end, in a car that has already been treated. As the solution, it is what brings the client back on Friday.
Ozone: read the machine's manual
Ozone is an odour-treatment tool and a respiratory hazard. It is used with the vehicle unoccupied, and the car has to be aired before anyone gets back in.
We publish no times and no doses: every machine has its own, and the manufacturer sets them. Your generator's safety rules are not recommendations — they are the condition for using it at all.
The cars to turn down
Some interiors do not go back to zero. Years of daily smoking take the odour into the foam and the back of the liner, and past that point full recovery stops being a question of method.
That conversation belongs in the quote, not at handover. Say what you can do, say what you cannot, and charge for the work you will actually carry out. A warned client pays; a surprised one asks for the money back.
This week
- On the next odour quote, smell the car closed up before you give a price
- Check the cabin filter before accepting the job, and put it in the number
- Write down what counts as full recovery and what counts as reduction
- A week after handover, call the client and ask about the smell — it is the only assessment that matters
Bookings in, chaos out.
Telmo Antunes
detailmasters agent
I've been passionate about detailing ever since I bought my first car. After filming and photographing for some detailing studios I fell in love with the craft and dreamt of one day being able to work in that market. That's why I created Detail Masters, and that's why you can trust me to help you scale your business to the success it deserves.
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