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How to Get Rid of Old Person Smell in a House: A Room-by-Room Guide

Someone on r/AskIreland asked this month whether the smell in a 90-year-old house is in the walls, and whether the only cure is demolition. It almost never is. But the fix depends entirely on which of three smells you actually have.

By The Soap Digest Editors ·September 20, 2026 ·10 min read

Sunlit empty living room with sash windows open, pale linen curtains lifting, bare floorboards and a folded dust sheet on a sage armchair — Ventilation and source removal do most of the work. Everything else is finishing.

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In this guide

First, work out which of the three smells you have
Why the smell survives a deep clean
The order that actually works
Ozone generators: read this before you buy one
Air fresheners and wax warmers make the number worse, not better
If a smoker lived there
If the smell is coming from a person, not the house
When to get someone else involved
The bottom line

A reader on r/AskIreland asked this month why old houses carry that particular smell, and whether it is soaked so deep into ninety years of plaster and concrete that the only way out is a demolition crew. The replies ranged from washing the ceilings to stripping the carpet to running a dehumidifier for a month.

They are all partly right, because “old person smell in a house” is not one smell. It is at least three, they come from different places, and the reason people spend a fortune and stay disappointed is that they pick a fix for the wrong one.

The short version

Work out which smell you have first: body-oil odor (2-nonenal), damp and microbial mustiness, or building and tobacco residue. They smell different and need different work.
The reservoirs are almost always the soft, porous things — carpet, underlay, curtains, upholstery, mattresses, duct dust — not the masonry.
Ventilation and source removal do the heavy lifting. The EPA’s own guidance puts reducing sources and airing with outdoor air ahead of any machine you can buy.
Be careful with ozone generators, the most-recommended fix on Reddit. The EPA says ozone is not effective at removing many odor-causing chemicals at concentrations that stay within public health standards, and that it can damage the lungs.
If a person in the house is the ongoing source, cleaning is a treadmill until that is handled too.

First, work out which of the three smells you have

This is the step almost everyone skips, and it decides everything else.

Body-oil odor (2-nonenal). Sweetish, greasy, a bit like old cooking oil or stale cardboard. It comes from the skin. 2-Nonenal was identified in human body odor in 2001 by Haze and colleagues, who found it in samples from older subjects and not in younger ones. It is an oxidation product of skin lipids, which matters here for one reason: it is a fatty molecule. PubChem lists it as soluble in oils and insoluble in water, with an XLogP3 of 3.1. It will not rinse away with water, and it clings to anything that holds oil — fabric, foam, dust.

Damp and microbial. Earthy, cellar-like, wet-cardboard. This is a moisture problem, and it will not respond to odor treatment at all until the moisture is fixed.

Building and tobacco residue. Sharp, ashy, chemical, or a distinct “old wood” note. Former smokers’ homes are the clearest case. Several r/CleaningTips posters describe apartments where the previous tenant smoked for decades, and the smell outlived new paint and new flooring.

A useful test: shut the house up for three days, leave, then walk in and breathe once before you take your coat off. Olfactory adaptation is measurable and quick, and it recovers when you leave the odor — Dalton’s 2000 review describes exactly the pattern readers report, where you notice the smell after time away and then stop noticing it within minutes. One r/CleaningTips reader who cleans homes professionally summed up the general version of this neatly.

A commenter in r/CleaningTips · thread

“everyone's home carries its own smell”

Why the smell survives a deep clean

Because you cleaned the wrong things, in the wrong order.

Stripped bedroom mid-clean: a bare quilted mattress on a wooden bed frame, folded curtains and cushion covers stacked in a woven basket, and a rolled-up rug leaning against a cream wall — The things you can carry out of the room are usually the things holding the smell.

The odor is not distributed evenly through the house. It sits in reservoirs — porous materials that absorbed it slowly and release it slowly. Carpet and underlay, curtains, upholstery foam, mattresses, cushion inserts, and the dust that has been circulating through the ducts for twenty years. Hard, sealed surfaces hold only a surface film, which is why wiping a wall gives you a genuine but short-lived improvement.

For body-oil odor specifically, fabric is the worst offender, and synthetics are worse than cotton: in controlled testing by Callewaert and colleagues, polyester developed a stronger odor profile than cotton after identical wear. Applied to a house, that means polyester curtains, poly-blend upholstery and synthetic throws are the items most worth treating first, or replacing.

A commenter in r/AskIreland · thread

“old plaster and concrete soak up everything like a sponge”

That instinct is common and mostly wrong in a useful way. Plaster does hold a surface film, and washing walls and ceilings genuinely helps. But if the room still smells a week later, the reservoir was never the wall.

The order that actually works

Four-step sequence for clearing household odor: ventilate and check humidity, strip and wash soft furnishings, wipe hard surfaces top down, then reassess what is left — Do these in order. Judging the result before step three tells you nothing.

1. Ventilate, and find out how damp the room is. Open windows on opposite sides of the house for cross-flow. Get a cheap hygrometer. The EPA recommends keeping indoor relative humidity below 60 percent and ideally between 30 and 50 percent. If you are above that, everything else you do is temporary.

2. Strip every soft surface out of the room. Curtains, cushion covers, throws, bedding, mattress protectors, rugs. Wash them with the routine that actually removes sebum rather than masking it — the same method we cover in getting old person smell out of clothes: a longer, warmer wash, an enzyme powder, and an extra rinse. Smell each item damp, before it dries.

3. Wipe hard surfaces from the top down. Ceilings first, then walls, then skirting, then floors, then the things nobody wipes: the tops of doors and door frames, window blinds, radiator fins, light fittings, extractor grilles, and the vent covers, which come off with a screwdriver and are usually a shock. A detergent solution is fine; for a greasy film, a degreasing cleaner works better than a disinfectant, because the problem is oil, not germs.

4. Then, and only then, judge what is left. If the smell is gone, stop. If it comes back only after the house has been shut for a few days, you have a remaining reservoir — ducts, attic insulation, carpet underlay — and that is the point to consider a professional duct clean or replacing the carpet.

Ozone generators: read this before you buy one

This is the most enthusiastically recommended fix in the r/CleaningTips apartment thread, and it deserves a straight answer.

The US EPA’s position is explicit. At concentrations that do not exceed public health standards, ozone is not effective at removing many odor-causing chemicals. Inhaled ozone can damage the lungs; relatively low amounts can cause chest pain, coughing, shortness of breath and throat irritation. The EPA also notes that controlled studies have measured ozone concentrations considerably higher than public health standards even when a user follows the manufacturer’s operating instructions, and that ozone does not reach contaminants embedded in porous materials — which is precisely where household odor lives.

If you use one anyway, nothing living stays in the space, and the room is thoroughly aired before anyone goes back in. It is not a substitute for removing the source.

Air fresheners and wax warmers make the number worse, not better

Masking is tempting because it works for an hour. But plug-ins, sprays and scented wax warmers are a source of volatile organic compounds in their own right — the EPA lists air fresheners among common household VOC sources, and links VOC exposure to eye and respiratory irritation and headaches, with ventilation as the recommended control.

If you want a machine, a portable air cleaner with a substantial activated carbon or sorbent filter is the one with a plausible mechanism for gases and odors. The EPA’s guide is realistic about it: no air cleaner removes all pollutants, and the most effective steps are still reducing sources and ventilating with outdoor air. Treat filtration as the thing you run after the reservoirs are gone.

If a smoker lived there

Tobacco residue behaves differently, and the research is sobering. Matt and colleagues tested cleaning protocols in low-income multiunit housing in 2021 and found that surface nicotine fell by roughly half and stayed down at three months, but nicotine in dust dropped about 60 percent immediately and then returned close to baseline within three months, as embedded reservoirs replenished it. Their conclusion was that cleaning has to address the persistent reservoirs, not just the surfaces.

In practice that means the soft furnishings and, often, the carpet and underlay have to go rather than be cleaned. Sealing primer on walls and ceilings is worth doing here, unlike in most other cases — but after removal, not instead of it.

If the smell is coming from a person, not the house

This is the case the cleaning threads keep circling back to, because it is the one where cleaning alone never finishes the job. If someone in the household is an ongoing source of 2-nonenal, the fabric re-absorbs it as fast as you wash it, and the room resets in a fortnight.

The skin side is a separate piece of work, and we have covered where it does and doesn’t help in does persimmon soap actually work and how to use it. Persimmon tannin soaps are the most commonly recommended option in these threads, and Reddit brings them up unprompted in house-smell posts as well as body-odor ones. There is no peer-reviewed human trial of persimmon soap for nonenal, and we say so every time.

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When to get someone else involved

Call a professional if you can smell damp but cannot find it, if there is visible mold over roughly a square metre, if the smell is sweet and chemical rather than organic (possible gas or a failing appliance — leave and call the utility), or if you suspect a dead animal in a cavity or attic.

See a doctor if a person’s body odor has changed noticeably and recently, or is accompanied by night sweats, weight change or a rash. The NHS advises seeing a GP when body odour changes and self-care hasn’t helped. Sudden changes in how things smell to you — smelling something no one else can — are also worth raising with a doctor rather than treating as a cleaning problem.

If you are not sure whether the smell is on you or in your house, the check in can you smell your own body odor is the cheapest place to start.

The bottom line

Old person smell in a house is nearly always a reservoir problem, not a structural one. Find out which of the three smells you have, ventilate and fix the humidity, strip and wash the soft furnishings, wipe hard surfaces from the ceiling down, and reassess before you spend money on machines. Skip the masking products, be careful with ozone, and if someone in the house is the source, deal with that in parallel — otherwise you will be doing this again next spring.

Frequently asked questions

Is old person smell really in the walls?

Usually not in the structure itself. The reservoirs that hold odor are the porous, absorbent things in front of the walls: carpet, underlay, curtains, upholstery, mattresses, and dust inside vents and ducts. Painted plaster and concrete hold surface films that wash off. Readers who stripped carpet, cleaned ducts or replaced attic insulation often report the smell going with them, which points at the contents rather than the masonry.

Does an ozone generator get rid of old person smell?

Be careful with this one, even though it is the most upvoted answer on Reddit. The US EPA states that at concentrations that do not exceed public health standards, ozone is not effective at removing many odor-causing chemicals, that inhaled ozone can damage the lungs, and that some machines can produce concentrations well above health limits even when used according to the manufacturer's instructions. It also cannot reach contaminants embedded inside porous material.

Will painting over it work?

Painting seals a surface film, and it does help on walls and ceilings that have genuinely been coated by years of cooking, smoke or skin oil. It does nothing for carpet, upholstery, curtains or ductwork, which is why people who paint an entire house and still smell it are so common in these threads. Wash first, paint second, and only after the soft furnishings are dealt with.

How long should it take to go away?

A soft-furnishings-and-ventilation reset usually shows a clear difference within a week or two. If you have done that and the smell returns whenever the house has been shut up for a few days, you are probably dealing with a remaining reservoir (ducts, attic insulation, underlay) or with damp rather than body odor.

Can I smell my own house?

Poorly, and this is well described in the research on olfactory adaptation: sensitivity to a constant background odor drops steadily with exposure and recovers when you leave it. That is exactly the pattern readers describe, noticing the smell after a few days away and then losing it again. Come back from a trip, walk straight in, and trust that first ten seconds.

Sources

About The Soap Digest Editors

We research persimmon soap, nonenal and mature-skin cleansing using published studies, brand ingredient lists and what real users report in public forums. We cite our sources and update guides when the facts change. We haven't lab-tested these products ourselves, and we say so.

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