TL;DR
Odor is a source problem, not an air problem. Fragrance and air fresheners hide it for hours and change nothing, while finding and removing the source solves it permanently. Work through the five usual suspects in order: soft surfaces, drains and traps, filters and ducts, cabinet and closet interiors, and any moisture. Most house smells resolve within a week of doing that.
Why does a new house smell like someone else?
Every household leaves a scent signature built from cooking, pets, cleaning products, laundry, and time. It absorbs into soft surfaces, settles as a film on hard ones, and sits in drains, filters, and cabinets. It reads as strange to you only because it is not yours, and it fades once its sources are removed.
That is worth saying plainly, because the first instinct is often to assume something is wrong. Usually nothing is wrong. Something simply needs washing.
Find the source before you treat anything
Do this on the empty day, in the morning, with the home closed up overnight if you can. Odor is strongest before ventilation.
Walk room to room and note where it intensifies. Then get closer: open every closet and cabinet and smell inside, smell at the floor along walls, at each drain including the laundry and any unused bathroom, at the return air register with the system running, inside the refrigerator, dishwasher, and washing machine, and at the garage door and water heater closet.
You are looking for a gradient. A smell that is uniform everywhere usually means the air system or a whole home issue. A smell that spikes in one spot has a specific source you can fix.
The five usual suspects
1. Soft surfaces. Anything porous holds odor: curtains, blinds, cushions if furniture stayed, and any fabric left behind. Launder what you can at the warmest temperature the care label allows. Take down and wash curtains before you unpack, since it is much easier while rooms are empty.
2. Drains and traps. A dry P trap lets sewer gas straight into the room, and it is extremely common in a home that sat vacant. Run water in every sink, tub, and shower for a minute or two, and flush every toilet. Also check the floor drain in a laundry room or basement, which often needs a cup of water poured directly in. This alone fixes a surprising share of complaints.
3. Filters and ducts. The furnace or air handler filter holds the last stretch of the home's air. Change it before you sleep there. Filters are part of move in cleaning for exactly this reason. Also clean the range hood filter and vacuum return and supply registers.
4. Cabinet, closet, and appliance interiors. Cabinets absorb cooking odor, refrigerators hold it in the gaskets, the dishwasher holds food in its filter, and the washing machine holds it in the door gasket. Clean each, run the dishwasher and washer empty on a hot cycle, and leave doors open to dry. The kitchen pass is in cleaning a kitchen you know nothing about.
5. Moisture. A damp, earthy smell points to water, and water is a different category of problem. See below.
Air exchange beats air freshener
Ventilation removes odor molecules. Fragrance adds molecules on top of them.
Open windows on opposite sides of the home to create a cross draft, and run bathroom and kitchen exhaust fans, which vent outdoors. A box fan in a window facing out pulls air through the whole home surprisingly quickly. Do this for several hours a day for the first week, weather permitting.
Two cautions. Scented plug ins and sprays mask while the source keeps releasing. And skip ozone generators in an occupied home, since ozone is a respiratory irritant and does not address the source either.
Hard surfaces still carry film
Cooking releases an aerosol that lands as a thin, slightly tacky film that holds odor. It is heaviest in the kitchen and spreads further than people expect.
Wash the kitchen walls and ceiling, the cabinet exteriors and tops, the range hood and its filter, and the backsplash. Then do doors, frames, and trim throughout the home, plus light switch plates.
Use warm water with a little dish soap. Test any degreaser on a hidden spot first, since degreasers can burnish flat paint. On natural stone, use pH neutral products only, because vinegar and lemon permanently etch marble, travertine, and limestone.
Specific smells, specific approaches
Musty or earthy. A moisture signature that deserves attention rather than product. Look for water staining under sinks, around windows, and at the base of exterior walls, and check whether bathroom fans actually vent outside. Persistent or spreading mustiness, visible growth, or any history of water intrusion is a remediation question, and remediation is a separate trade. The starting diagnostics are in getting rid of a musty smell.
Smoke. The most stubborn category, because tar residue coats every surface including ceilings and cabinet interiors. It usually needs repeated washing of all hard surfaces, replacement of soft goods, and filter changes. Removing smoke odor covers the realistic scope.
Pet odor. Trace the location precisely rather than treating the room. Enzyme products are the right chemistry, used with cold water rather than hot, since heat sets protein soils. If the source soaked into flooring, cleaning the surface will not solve it.
Sour or garbage like. Check the disposal splash guard, the dishwasher filter, the trash cabinet interior, and the drain traps before assuming anything worse.
Give it time, and stop adding scent
Once the sources are handled, odor keeps declining for days as remaining molecules off gas and get ventilated away. Resist the urge to judge the result on day two.
Keep the home ventilated, keep fragrance out of it, and reassess after a week. If the smell is unchanged after a thorough source pass, that points to something structural such as a moisture problem, a duct issue, or a source under flooring, and that is worth having someone look at directly.
Working through a move in cleaning checklist at the same time handles the sources and the cleaning in a single pass rather than twice.
FAQ
How do I get rid of a previous owner smell in a house?
Find and remove the source rather than covering it. Launder or replace soft surfaces, refill dry drain traps by running every fixture, change the furnace filter, clean cabinet and appliance interiors, wash hard surfaces, and ventilate heavily for the first week.
Why does my new house smell even after cleaning?
Usually because a source was missed. The most commonly overlooked ones are dry drain traps, the furnace or air handler filter, the washing machine gasket, the dishwasher filter, cabinet interiors, and the range hood filter. A moisture source is the other common cause.
Do air fresheners get rid of house smells?
No. They add fragrance on top of the odor and the source keeps releasing, so the smell returns as soon as the product fades. Ventilation removes odor molecules and source removal ends the problem, which is why both outperform any fragrance.
How long does it take for a house to stop smelling like the last owner?
With sources handled and daily ventilation, most homes improve noticeably within a few days and substantially within one to two weeks. Smoke and moisture related odor take longer and often need work beyond cleaning.
Is a musty smell in a house dangerous?
A musty smell indicates moisture, which is worth taking seriously and investigating rather than masking. Mold remediation is a separate trade from cleaning, so persistent or spreading mustiness, visible growth, or known water intrusion should be assessed by a remediation professional.
This sits inside the broader whole-home work covered by house cleaning services.
Odor work is mostly detective work, and it goes much faster on an empty home before anything of yours is in the way. Every home is different, so the real number depends on size, condition, and what you want covered. Get a quote and we will walk you through it.