Your carpet might look clean. There are no visible stains, you vacuum it regularly — all good, right? Research from the University of Arizona showed something else: the average household carpet contains 200,000 bacteria per square centimetre. For comparison, a toilet seat has around 500 bacteria per cm². The carpet is 400 times "dirty". And that's just the bacteria — dust mites, allergens, pesticides, heavy metals and chemicals from the street — that's a whole other story.
What is actually in your carpet?
Biological pollutants
| Pollutant | Source | Health effect |
|---|---|---|
| Dust mites | Skin flakes | Allergies, asthma |
| Bacteria | Shoes, food, animals | Infections, GI complaints |
| Fungi | Humidity, dirty shoes | Respiratory problems |
| Viruses | Sick household members | Seasonal illnesses |
| Pet hair and dander | Pets | Strong allergens |
| Pollen | Windows, shoes | Seasonal allergies |
Chemical pollutants
Shoes bring in everything from the street:
- Pesticides from lawns and parks
- Heavy metals (lead, cadmium) from traffic-heavy surfaces
- Polycyclic aromatic hydrocarbons (from asphalt and exhaust fumes)
- Herbicides and fungicides
- Bird droppings, rodent droppings, etc.
A University of Houston study showed that 90% of the pollutants brought into the home are carried in on shoes. A 'take your shoes off at the door' policy reduces this by 90% on its own.
Why is a vacuum cleaner not enough?
Regular vacuuming is essential, but it has its limits:
- Standard vacuum cleaners do not reach deeper than 1-2 cm into the fibres
- A HEPA filter vacuum cleaner captures particles down to 0.3 microns — but dust mites are 0.2-0.5 microns (borderline)
- Vacuuming does not remove chemical pollutants
- Vacuuming doesn't kill bacteria and fungi — it just moves them around
- Stains and liquids that have penetrated deeper — a vacuum cleaner cannot reach them
So, a vacuum cleaner is a daily preventative measure — but it's not a substitute for deep cleaning.
How often should a carpet be deep cleaned?
Recommended schedule
| Household situation | Recommended frequency |
|---|---|
| Single person, no pets, shoes at the door | Once a year |
| Couple with no children, no pets | Once to twice a year |
| Family with children | Two to three times a year |
| Pets in the flat | Three to four times a year |
| Allergies / Asthma | Every 3 to 4 months |
| Ground-floor flat by a busy road | Two to three times a year |
Carpet deep cleaning methods
1. Machine Extraction (Hot Water Extraction / HWE)
The gold standard in professional carpet cleaning. A machine (such as the Kärcher Puzzi) injects hot water with detergent under pressure and immediately extracts it back. This is the most popular method which:
- Reaches up to 3-4 cm deep into the carpet
- Removes dust mites, bacteria and chemical pollutants
- Effectively removes stains and deep-seated dirt
- Carpet dry in 2-6 hours
2. Dry cleaning
With chemical powders or foams — without water. Suitable for:
- Carpets that must not be damp (special materials)
- Emergency cleaning when there is no time to dry
- Regular refreshing between deep cleanings
3. Steam cleaning (steam cleaning)
Steam at 130°C kills 100% of dust mites, bacteria and fungi. It is not suitable for all carpets (it can shrink some natural materials), but it is excellent for synthetic carpets and regular disinfection.
4. Shampooing
An older method that uses foaming cleaners. Less effective than the HWE method and leaves behind chemical residue that attracts dirt faster. It is rarely recommended today.
DIY carpet cleaning: what you can do yourself?
Carpet Preparation
- Vacuum the carpet in both directions (horizontally and vertically) for better fibre penetration
- Pre-treat any visible stains.
- Remove furniture from the carpet if possible
Dry cleaning method
- Sprinkle a commercial carpet cleaning powder (available at DM, Konzum)
- Work it into the fibres with a brush
- Leave for 30-60 minutes
- Vacuum thoroughly
This method is good for refreshing, but not for deep cleaning.
When to call in the professionals
- Oriental or handmade rug (expensive materials require special treatment)
- Wool carpet (shrinks and bleeds colour with improper cleaning)
- Carpet with strong odours (urine, damp, smoke)
- A carpet that hasn't been cleaned for more than 2-3 years
- Carpet with allergens — children or allergy sufferers in the house
Local: Dugo Selo, Sesvete, Vrbovec and surrounding areas
Professional deep carpet cleaning by machine using the extraction method is available in Dugo Selo, Sesvete, Brckovljani, Vrbovec and Sveti Ivan Zelina. There's no need to take your carpets away — the machine comes to you, and your carpet is dry and ready to use on the same day. No special preparation is required.
Frequently Asked Questions (FAQ)
Can a carpet be cleaned wet without machines?
Yes, but with limited results. Hand washing (a towel soaked in cleaner) only reaches the surface of the fibres. For deep cleaning and disinfection, extraction equipment is necessary, which both injects and extracts the liquid.
Is it normal for the carpet to smell while it's drying?
A slight damp smell is normal and will disappear as soon as the carpet is dry. A strong smell that lingers after drying is a sign that the carpet contains a lot of organic build-up (pet hair, food, urine) that was loosened during cleaning — which means the clean was necessary.
How long does carpet drying take?
With the professional extraction method, the carpet is dry in 2-6 hours, depending on its thickness and material. With good ventilation (open windows, a fan), the drying is faster. Avoid walking on the wet carpet.
Can an oriental rug be washed?
Oriental rugs require special treatment — hand washing at a specialised cleaner or careful professional dry cleaning. Standard extraction cleaning can damage the colours and weave. Always consult a specialist for valuable rugs.
Should I protect the carpet after cleaning?
Yes — Scotchgard or a similar protective coating creates a microscopic layer that repels liquids and gives you more time to react. It is applied immediately after cleaning and drying, and lasts for 12-18 months.
How much does professional carpet cleaning cost?
Depending on the size and method: a smaller carpet (up to 4 m²) is €25-45, a larger one (4-12 m²) is €50-90. With minimal call-out charges, the total for an average flat works out to €80-150. An alternative is to hire a Kärcher Puzzi machine (€50-65/day) and clean all the carpets and furniture yourself.
Is it better to clean a carpet in summer or winter?
Summer is ideal — faster drying due to higher temperatures and ventilation. In winter, cleaning is more difficult due to slower drying and the risk of moisture in an enclosed space. Spring and autumn are a happy medium — moderate temperatures and good ventilation.
Can I put my child on the carpet immediately after cleaning?
Wait until the carpet is completely dry — a minimum of 3-4 hours for thinner carpets, 6-8 hours for thicker ones. Dry fabrics are safe immediately, but moisture can cause slipping and can be absorbed from the floor.
Conclusion
A carpet that looks clean can be one of the dirtiest items in your home. Regular vacuuming is essential, but it is not enough to eliminate bacteria, dust mites and chemical pollutants that nest deep within the fibres. Deep cleaning once or twice a year — depending on your home's circumstances — is the only method that truly restores the carpet to a healthy state.
If you don't have the right equipment or simply want to leave the job to the professionals, there are solutions that can significantly speed up and simplify the entire process.