A persistent smell does not identify its cause. It may come from accessible waste, a textile, a drain, a leak, the building, pests or an urgent hazard. Classify the likely source before choosing a product.
Fragranced products can temporarily change what you notice, and some release volatile organic compounds. The “two to five times higher” figure covers selected organic compounds in one study, not the overall air in every home.
A fragrance does not prove that the source has gone
A fragranced product may change how an odour is perceived without showing that its source has been removed. Some products are sold as odour neutralisers, but performance and material compatibility depend on the product and cause. If the smell returns, look for what is producing it.
Put fragrances, VOCs and combustion in context
Sprays, diffusers and other home fragrances can emit volatile organic compounds. Candles and incense also produce particles when they burn. The amount depends on composition, duration of use and ventilation. Follow the label, limit use and ventilate when it is safe to do so.
What the “two to five times higher” figure actually covers
The EPA-cited TEAM study measured about a dozen common organic pollutants at average levels two to five times higher indoors. It does not say that the total air in every home is two to five times more polluted. The figure supports source reduction and ventilation; it does not diagnose an odour. See the EPA's guidance on VOCs and indoor air quality.
Before cleaning: rule out an emergency and classify the source
A gas smell, burning smell, strong solvent smell or symptoms are not routine cleaning issues. If you smell gas, do not operate switches or use a phone inside; leave the building and call 112 and the network operator responsible for your address from outside. Carbon monoxide has no smell: symptoms near a fuel-burning appliance are also a reason to leave and call emergency services.
- Routine cleaning: accessible waste, forgotten food, a bin, an accessible seal or filter, or a recent incident on a washable surface.
- Drainage: a trap on a rarely used drain may have dried out. A strong or recurring smell, or one affecting several drains, should be checked by a plumber or building manager.
- Building and damp: a musty smell may accompany a leak or ventilation problem, but does not identify the cause by itself. Contact the landlord, building manager, plumber or building specialist.
- Pests: droppings, nests, unusual fly activity or an inaccessible dead animal should be handled by pest control or the building manager.
- Textiles: check the care label and ask a textile specialist if contamination appears deep.
Textiles: check the material and depth of contamination
Start with the care label and test any action on a hidden area. Avoid soaking a sofa, carpet or mattress. Baking soda, steam and spray extraction are not universal treatments. If the source has reached foam, backing or the floor below, a textile specialist should first assess the material and cause.
A staged process, not a guaranteed cure
1. Safety. First rule out gas, burning, a strong chemical smell or symptoms.
2. Classification. Decide whether the likely cause belongs to routine cleaning, drainage, the building, pests or textiles.
3. Accessible action. Remove only a source that can be handled safely and in line with product or material instructions.
4. Ventilation. Renew the air when it is safe, without relying on one universal duration. Our guide to airing your home well offers practical pointers.
5. Reassessment. If the smell returns, stop trying successive remedies and contact the appropriate professional. For accessible surfaces, follow the product and material instructions. Our guide to natural cleaning products also explains why home recipes are not universal.
Who should deal with each cause?
Fast Clean can review a request for ordinary home cleaning or end-of-tenancy cleaning. The possible scope is confirmed after review and set out in the quotation.
Drain and leak problems belong with a plumber or building manager. Persistent damp, suspected hidden mould or ventilation problems belong with the landlord, building manager or building specialist. Signs of pests belong with pest control. Deeply affected upholstery, carpets or mattresses belong with a textile specialist.
Fast Clean is not presented as a plumber, building diagnostician, pest-control company or specialist textile cleaner.
For routine cleaning of shared areas, see our page on cleaning for apartment buildings and common areas.
Need Help with Ordinary Home Cleaning?
Describe the rooms and ordinary cleaning tasks you need. Fast Clean will confirm the possible scope after reviewing the request. Building, drainage, pest and deeply affected textile issues remain with the appropriate specialist.
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- U.S. Environmental Protection Agency (EPA), Volatile Organic Compounds' Impact on Indoor Air Quality. Accessed August 10, 2026.
- U.S. Environmental Protection Agency (EPA), Improving Indoor Air Quality. Accessed August 10, 2026.
- U.S. Centers for Disease Control and Prevention (CDC), Mold. Accessed August 10, 2026.
- Creos Luxembourg, Gas safety tips. Accessed August 10, 2026.
- U.S. Centers for Disease Control and Prevention (CDC), How to Trap Up to Remove Rodents. Accessed August 10, 2026.