You've vacuumed. You've sprinkled powder on it and vacuumed that up again. Yet you can still smell the carpet as soon as you walk into the room, especially when the heating comes on. But why doesn't vacuuming help with that smell, and what does? In this article you'll find out where the smell comes from, how to clean a carpet in six steps and why stains and odours are two different problems.
Short answer
A carpet that keeps smelling after vacuuming has moisture and dirt in its base. Vacuuming only removes dry dirt from the pile, while the smell is caused by bacteria in the fibre base and the backing. Cleaning with spray extraction puts water into the fibre and sucks that same water back out along with the dirt. It's the only method that removes the source.
Why does a carpet keep smelling after vacuuming?
A carpet keeps smelling because the odour isn't in the pile, but underneath it.
A vacuum cleaner removes dry dirt from the top part of the fibre. That's exactly what it's made for. But anything that was ever liquid has sunk down: to the fibre base and the backing of the carpet.
There it stays, in an environment that's warm and sometimes still slightly damp. Bacteria break down those residues, and that breakdown is what you smell. As long as those residues stay put, the smell returns whenever the room gets warmer or more humid.
That also explains why you notice it in autumn. The heating goes on, the fibre warms up and the smell is released. Right about now, in other words.
Stain or smell: two different problems
You see a stain and you smell an odour, and you don't tackle them the same way.
A fresh stain is still near the top and can usually be dealt with by dabbing and using a product. A smell means something has sunk in, and that may well have happened months ago without leaving a stain.
That's why a stain spray won't solve an odour problem. It treats the surface. The source lies a few millimetres lower. The reverse is also true: a carpet that has been thoroughly extracted can still have a faint ring where the stain was.
How to clean a carpet in 6 steps
Below you'll find six steps. You start by vacuuming thoroughly, followed by the test, the pre-treatment, the extraction, the final suction and finally the drying.
1. Vacuum more slowly than you're used to
Vacuuming comes first, and the pace determines the result. Go over the carpet in two directions and move slowly, so the brush can lift the pile. Any loose dirt you leave behind turns into mud in the next step.
2. Test in a corner that's out of sight
Do the test under a sofa or in a corner. Dampen a small area, let it dry and check whether the colour runs or changes. Does the carpet leave colour on your cloth? Then stop here, and a specialist is the safer route.
3. Pre-treat the worst spots
The pre-treatment is only for the spots where the smell is strongest. Apply the Clean and Fresh Stain Remover there and leave it to work briefly, so the old residues loosen before you start extracting.
4. Work in overlapping strips with extraction
With extraction, you spray water into the fibre and suck it straight back up. That's the job of the Achaté Spot Cleaner, which sprays tap water and sucks up the dirty water in the same movement. Work in strips that overlap by a few centimetres and pull back slowly, because the suction does the work. One slow pass removes more than three quick ones.
5. Go over it again without water
Do the final suction with the same machine, but without spraying. That way you remove the last of the moisture that would otherwise stay in the backing. This is the step that determines how quickly the carpet dries.
6. Let the carpet dry completely
Drying is part of the cleaning, because a carpet that stays damp for too long will end up smelling worse than before. Open a window or let a fan blow over the surface. Don't walk on it in shoes and don't put a rug or furniture on it until it feels dry.
Note: don't use more water in the hope of speeding things up. Too much moisture reaches the backing and the subfloor, and that's exactly how an odour problem gets bigger instead of smaller.
Does a steam cleaner work on carpet?
A steam cleaner works on carpet to freshen the fibre and tackle bacteria, but it doesn't get the dirt out.
It's the same distinction as with a sofa. Steam brings heat and moisture into the fibre, which reaches the source of the smell, but nothing comes out. Whatever you loosen stays in the carpet.
For a carpet that's just musty, that can be enough. If there's really something in it, combine the two: extraction first to remove the dirt, then steam for hygiene if you like.
Don't want two devices for that? The Achaté Spot Cleaner PRO with Steam & Hot Water does both. Steam at around 100 °C, heated water at 50 °C and spray extraction that sucks up the dirty water straight away. That heated water loosens old, dried-in residues in the fibre base.
How do you get dog smell out of a carpet?
Dog smell sits in the base and the backing, so the only way to remove it is with extraction.
The difference with ordinary odours is the cause. Pet odour comes from grease in the coat and sometimes from urine, and urine soaks right through to the subfloor. A surface treatment masks that for a few days.
So work in two or three rounds with drying in between, instead of using lots of water in one go. Does the smell keep coming back in exactly the same spot once it's completely dry? Then it's in the subfloor and no longer in the carpet.
Which Achaté product should you use for carpet?
That depends on the problem: a fresh stain, a smell from the base, or a carpet that's just musty. In the table below you'll find the right model for each situation.
Achaté models for each carpet problem
| Situation | Model | Why this model |
|---|---|---|
| Fresh stain, one spot | Clean and Fresh Stain Remover | Spray for targeted treatment, no device needed |
| Recurring smell in the base | Achaté Spot Cleaner | Spray extraction on tap water, gets the dirt back out |
| Old, dried-in residues or pet odour | Spot Cleaner PRO with Steam & Hot Water | Heated water at 50 °C loosens old residues |
| Carpet is just musty, no stains | Handheld Steam Cleaner PRO with textile attachment | Heat tackles the bacteria, without much moisture |
| Stairs and small rugs | Achaté Spot Cleaner | Compact, fits on a stair tread |
Torn between the standard Spot Cleaner and the PRO? The standard one works with tap water and is enough for maintenance and for recent odours. The PRO adds steam and heated water, and you'll only notice that difference with stains and residues that have been there for months.
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How often should you clean a carpet?
How often you should clean a carpet depends on who walks on it and what happens on it.
Do you vacuum weekly? Then a deep clean once or twice a year is enough. If the carpet is in the hallway, or a dog walks on it, that clean comes round sooner.
Two signs tell you more than a schedule. The first is the smell when you walk in, because that's what's sitting under the pile. The second is the pile itself: if it lies flat and doesn't spring back, there's dirt between the fibres taking away its bounce.
Fresh carpet again? Choose extraction from Achaté
A carpet gets clean by putting water into the fibre and taking it straight back out. Vacuuming tackles the pile, steam tackles hygiene and extraction tackles the source. For a smell that keeps coming back, only that last one is the solution.
The Achaté Spot Cleaner works with spray extraction using water alone and is the compact choice for carpets, stairs and rugs. If the smell runs deep, the Achaté Spot Cleaner PRO with Steam & Hot Water gives you more grip on old residues thanks to its heated water. For a single fresh stain, there's the Clean and Fresh Stain Remover. The same method then works on your mattress.
Want a fresh carpet without having it collected? Take a look at the Achaté spot cleaners and choose the model that suits your floor.
Frequently asked questions about cleaning carpet
How do you get a bad smell out of a carpet?
You get a bad smell out of a carpet by removing the source in the base, and you do that with spray extraction. Water goes into the fibre and is sucked straight back up along with the dirt. Powders and sprays work on the surface and mask the smell as long as the residues underneath stay put.
Can you clean a carpet with a steam cleaner?
You can freshen a carpet with a steam cleaner and make the fibre hygienic, but steam doesn't get the dirt out. For a musty carpet without stains, that can be enough. If there's dirt or a smell in the base, you need extraction, which sucks up the water along with the dirt.
How long does a carpet take to dry after cleaning?
That depends on the pile depth, the amount of water and the ventilation in the room. A short-pile carpet dries fastest, a deep-pile one slowest. Only walk on it again once it feels dry and don't put anything on it, because moisture that can't escape causes a new smell.
Can you wet-clean a wool carpet?
Wool is more delicate than synthetic fibres and can shrink or felt with too much moisture and heat. So use as little water as possible, keep the temperature low and always test in a hidden corner first. For a valuable or antique wool rug, a specialist is the safer choice.
