# Odour Removal Ottawa | Hydroxyl & Ozone Treatment

URL: https://extremecleaningottawa.ca/odour-removal/

![Industrial hydroxyl generator running in an empty, clean room](/images/misc/industrial-hydroxyl-generator-running-in-an-empty-.webp)

Rapid dispatch, 100% discreet

# Odour & Odor Removal Ottawa and Eastern Ontario: Hydroxyl, Ozone & Molecular Deodorization

Last updated: September 10, 2026

Extreme Cleaning Ottawa eliminates severe biological, smoke, urine, decomposition, and tobacco odours across the National Capital Region using industrial hydroxyl generators, ozone shock treatment, thermal fogging, and molecular oxidation rather than scent masking. Our crews handle single-room contamination through full-property whole-home treatment for landlords, insurers, families, and property managers who need real deodorization documented before turnover.

Volatile organic compounds and nicotine tar penetrate drywall, subfloor, insulation, and duct interiors up to several centimetres in porous surfaces, and typical scent-masking treatments only cover the odour temporarily before it re-emerges. Ottawa freeze-thaw humidity swings can also reactivate trapped odour molecules from spring melt through summer. Our approach treats the source at the molecular level with hydroxyl generators, industrial ozone shock, HEPA activated carbon filtration, and shellac-based primer sealer where required.

Extreme Cleaning Ottawa handles biological decomposition odour removal, heavy cigarette and tobacco smoke elimination, urine and pet odour treatment, sewage backup odour remediation, and post-fire smoke odour restoration. Every project includes pre-treatment air quality assessment and post-treatment verification before we sign off on the work.

We provide odour and odor removal services throughout Ottawa and Eastern Ontario, including Kanata, Nepean, Orleans, Barrhaven, Stittsville, Gloucester, Rockcliffe Park, Vanier, Manotick, Gatineau, Aylmer, Cornwall, Kingston, Brockville, Belleville, Perth, Smiths Falls, Carleton Place, Arnprior, Kemptville, Rockland, Embrun, Casselman, Hawkesbury, Pembroke, Petawawa, and surrounding communities. Every treatment plan is written before work begins and verified before handover.

-   Unmarked discreet vehicles
-   Bilingual EN/FR crews
-   Insurance direct billing
-   Built for Ottawa cold-climate cleanup
-   Free on-site assessment
-   Category 3 biohazard containment ready
-   HEPA filtration on every dispatch
-   200 km Eastern Ontario service radius

Call 24/7: 613-702-1799

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Typical range $300 to $6,000 single room to full property

WSIB Compliant & Fully Insured

Licensed & Insured

12 Specialties Under One Roof

Written Quotes, No Surprises

Where This Usually Starts

## The Problems Behind Every Odour Removal Call

### Masking never lasts

Air fresheners and store-bought sprays cover smoke, urine, or decomposition odour for a day, then it comes right back.

### The smell affects daily life

A property that smells wrong is hard to live in, hard to sell, and hard to have anyone over to.

### Worried it has soaked in for good

Odour that has penetrated drywall, subfloor, or insulation feels permanent until someone treats it at the molecular source.

What This Service Covers

## What Is Odour Removal?

We eliminate biological, smoke, urine, and decomposition odours at the molecular level using industrial hydroxyl generators and ozone gas decontamination, breaking the compounds down at the source rather than covering them.

We never use scent masking. Families who have been sold a perfumed treatment routinely report the original smell returning within weeks, usually stronger, because the source was never addressed.

Treatment scales from a single room to a full property. Where odour has saturated porous material, removal comes first, then oxidation, then sealing. That order is what makes the result permanent.

### What's included

-   Hydroxyl generators and ozone shock treatment
-   Molecular oxidation at the source, not masking
-   Smoke, urine, biological, and decomposition odours
-   Single-room through full-property treatment
-   HEPA and activated carbon filtration
-   Shellac-based primer sealing where required

![Ozone generator control panel and timer dial with coiled hoses](/images/features/close-up-of-an-ozone-generator-control-panel-and-t.webp)

### Where we do this work

Across every Ottawa district, the Gatineau side, and up to 200 km into Eastern Ontario. Free assessments throughout the coverage area.

See service areas

[/service-areas/ →](/service-areas/)

Have you ever scrubbed a room from top to bottom, only to have that stubborn smell return the next day? Odour removal often feels like a frustrating guessing game for many homeowners and business owners.

We know exactly how exhausting it is to constantly buy air fresheners that just mask a persistent problem.

A recent Health Canada report points out that indoor air quality relies heavily on tackling invisible compounds directly. The good news is that getting rid of them permanently is entirely possible. Our team has spent years tracking down hidden sources of terrible smells across Canada.

Grab a cup of coffee, and let’s go through it together. You might be surprised by how simple the science behind it actually is. We will walk you through the exact steps used to find and eliminate these issues.

## Why Do Odours Come Back After Treatment?

Because the smell itself was never the actual problem. Airborne volatile organic compounds (VOCs) released by a hidden source are the true cause. Our experience aligns with a 2023 study on Canadian residential air, which found VOCs account for about 20% of total organic compounds indoors.

Those particles will continue to release the moment any surface treatment stops if the origin stays in the building. These four specific sources show up most often in Ottawa homes and require direct attention:

-   Saturated carpet underlay and subfloors holding trapped liquids.
-   Nicotine tar and resin films coating walls and ceilings.
-   Biological residue hiding in wall cavities and duct runs.
-   Urine salts that have crystallized deep into the subfloor over time.

We see that none of these issues can be fixed by simply fogging a room. The leading industry guideline, the ANSI/industry standard S100 standard, states that the very first principle of odour control is physical source removal. Direct treatment or complete extraction is necessary before any oxidation process will hold long-term.

Our first step is always finding the source rather than just treating the air. Moisture meters and thermal imaging cameras help pinpoint exactly where compounds have penetrated. Flooring gets lifted where readings suggest deep saturation. We carefully inspect duct runs and thoroughly check the framing behind affected walls.

## Hydroxyl. Ozone. Thermal Fog.

Both hydroxyl and ozone technologies work by breaking the odour compound apart rather than covering it up. This chemical reaction is exactly what makes the final result permanent. We rely on these powerful methods to completely destroy the molecular structure of the smell.

Industrial hydroxyl generators, like the popular Odorox systems, produce hydroxyl radicals from ambient humidity and UV energy. These radicals react with volatile organic compounds and safely break them down into harmless water vapour and carbon dioxide. Our teams find this process takes more time but remains completely safe to run in occupied spaces. This safety factor matters hugely for tenanted units and for households that simply cannot leave during treatment.

Ozone gas decontamination, often called O3 shock treatment, acts much more aggressively. We saturate the entire space with ozone at heavy concentrations that oxidize almost anything organic. The comparison below outlines the key differences between these two powerful tools. This quick reference helps property owners understand which method fits their specific situation. We provide this breakdown so you know exactly what to expect.

| Feature | Hydroxyl Generators | Ozone Gas (O3 Shock) |
| --- | --- | --- |
| Speed of Results | Slower, gradual process | Fast, aggressive breakdown |
| Occupancy Safety | Safe for occupied spaces | Must be strictly unoccupied |
| Ideal Application | Tenanted units, mild smells | Heavy tobacco, severe jobs |
| Residue Risk | Leaves no chemical residue | Requires thorough ventilation |

Health Canada sets strict residential exposure limits for ozone at just 0.02 parts per million (ppm). Because shock treatments operate well above that limit, the space must be unoccupied and properly ventilated afterwards. Our technicians choose this faster route for heavy tobacco saturation and serious decomposition work.

Oxidation alone will not finish the job when compounds have deeply penetrated framing or subfloors. A heavy-duty product like Zinsser B-I-N shellac-based primer sealer is applied to those raw surfaces. We seal those surfaces to lock residual residue behind an impermeable film before any rebuild or repaint.

## Smoke. Decomposition. Mould. Pet. Sewage.

Every property tells a different story with specific smells requiring highly targeted approaches. Finding the right solution depends entirely on understanding the chemical makeup of the problem. We tackle a wide variety of challenging situations using specialized techniques. The most common issues encountered in the field include the following situations:

-   **Decomposition**, which is handled within our 
    
    trauma scene cleanup
    
    [/trauma-scene-cleanup/ →](/trauma-scene-cleanup/)
    
     process because the structural work comes first.
-   **Smoke and soot**, usually part of a broader 
    
    fire and smoke damage restoration
    
    [/fire-smoke-damage-restoration/ →](/fire-smoke-damage-restoration/)
    
     scope, including HVAC duct decontamination following fire restoration standards standards.
-   **Heavy tobacco**, where nicotine tar coats every surface, including inside fixtures and behind switch plates.
-   **Animal urine**, a massive issue since the 2024 Canadian Animal Health Institute survey reports that 65% of Canadian households now own pets.
-   **Biological and sewage odour**, generally treated alongside full decontamination work rather than on its own.
-   **Musty and mildew odour**, which is a moisture problem first and usually points to professional 
    
    mould removal
    
    [/mould-removal/ →](/mould-removal/)
    
    .

Each of these unique challenges requires a different chemical countermeasure. We always match the specific counteractant to the exact type of contamination present. Ammonia crystals from pet urine behave very differently than oily soot from a kitchen fire. Recognizing these differences prevents costly secondary damage to the property. Our approach ensures that the correct science is applied to every single job.

## What Does Thermal Fogging Add?

Thermal fogging uses high heat to create a microscopic, penetrating fog of specialized odour-counteracting agents. These tiny particles, often measuring between 10 and 50 microns, follow the exact same paths the original smoke or gas took through a building. We use professional-grade equipment like Electro-Gen foggers to push this mist into places that standard cleaning cannot reach.

> “The heated vapor easily penetrates into tiny cracks, deep cavities, and tight spaces behind baseboard trim.”

This technique serves as a powerful supporting tool rather than a standalone fix. We always pair it with physical removal and oxidation on complex smoke jobs. Contractors should never use fogging as a substitute for actual cleaning or material extraction. High-quality odorcides like those from ProRestore are designed to chemically neutralize the particles rather than just adding a heavy perfume. Our standard procedure ensures that once the full cycle is complete and the property is properly ventilated, the space reads completely neutral.

## How Do You Know When It Has Worked?

The final test is incredibly simple and entirely unforgiving. After proper ventilation, the property should smell like absolutely nothing. We refuse to accept a space that smells like citrus, a hotel corridor, or a harsh cleaning product.

If anyone can still detect the original odour on return, another cycle is run immediately. Handing a property back and simply hoping for the best is never an acceptable practice. We follow the industry standard Odor Control Technician (OCT) guidelines, which demand a truly neutral environment before completion.

Olfactory fatigue, commonly known as nose blindness, happens very quickly during this type of work. Crews working around a strong smell all day will naturally stop noticing it within hours. Our protocol requires a multi-step verification to combat this biological reality:

-   Ventilating the space completely to remove treatment gases.
-   Waiting for the air to settle into a natural state.
-   Bringing in a fresh inspector with an uncompromised sense of smell.

This vital second opinion acts as a fail-safe for tenanted and commercial properties. That final verification step is built directly into the handback process for every odour removal project. We provide this necessary assurance at absolutely no extra cost to you.

Reach out today to schedule a thorough inspection of your property. Getting professional help is the fastest way to breathe easy again. We are ready to help you reclaim your space.

## How Hydroxyl and Ozone Treatment Eliminate Odour at the Source

Hydroxyl and ozone treatments eliminate odour by oxidizing odour molecules at the chemical level rather than masking them with scent overlays. Understanding the difference between the two technologies and when each applies matters for durable outcomes.

### The Key Details

Hydroxyl generators produce hydroxyl radicals (highly reactive molecules that oxidize volatile organic compounds, protein residues, and biological odour sources) using ultraviolet light and moisture. Hydroxyl treatment is safe for use with occupants present, does not damage most materials, and is effective on porous items. Treatment cycles run twenty-four to seventy-two hours per space depending on odour intensity and material porosity.

Ozone shock treatment produces ozone (O3) at concentrations that oxidize odour molecules through direct chemical reaction. Ozone is highly effective on stubborn odours (smoke, decomposition, urine, tobacco) but is not safe for occupants, pets, or plants during treatment. Spaces must be fully evacuated. Post-treatment ventilation is required before reoccupation. Ozone can degrade rubber, some plastics, and certain fabrics with extended exposure.

### How It Actually Works in Practice

Application varies by odour category. Fresh smoke and mild biological odours often respond to hydroxyl treatment alone. Severe decomposition, extensive tobacco tar, or heavy urine contamination often require ozone shock followed by hydroxyl treatment to address both the source and the residual molecules absorbed into porous materials.

Complete odour elimination usually combines source removal, hydroxyl and ozone treatment, and where necessary shellac-based primer sealer applied to porous surfaces to encapsulate residual absorbed odour molecules.

## Removing Heavy Cigarette and Tobacco Smoke Odour From a Home

Heavy cigarette and tobacco smoke odour removal from an Ottawa home is one of the most persistent odour challenges because nicotine tar penetrates drywall, subfloor, insulation, HVAC ductwork, upholstery, and cabinet interiors at a molecular level over years of exposure.

### The Key Details

Effective removal requires phased treatment. Surface cleaning addresses accessible tar residue with alkaline degreasers that break the tar bonds without spreading them. Ceilings, walls, cabinetry, window frames, and hard-surface flooring receive documented cleaning with confirmed dwell times.

HVAC ductwork often carries decades of accumulated tar residue and is redistributed throughout the property every time the system runs. Duct cleaning through mechanical brush agitation, HEPA vacuum extraction, and antimicrobial application is often required for complete odour elimination. Filter replacement follows.

### How It Actually Works in Practice

Porous materials require category-specific decisions. Carpeting with heavy tar penetration typically requires replacement rather than restoration. Upholstery may respond to specialty cleaning but often requires replacement for durable outcomes. Drywall with tar-yellowed surfaces often requires shellac-based primer sealer application to encapsulate absorbed odour before repainting.

Hydroxyl treatment cycles run twenty-four to seventy-two hours to oxidize residual molecules in porous materials that cannot be removed physically. Ozone shock treatment may follow for severe cases with unoccupied spaces.

### What to Expect Next

Post-treatment verification confirms outcome. Rental turnover documentation, insurance-claim records, and pre-listing preparation all benefit from documented verification. Our Ottawa team provides before-and-after evidence for every project.

## Odour Elimination vs. Masking: Why the Difference Matters

Scent masking treatments cover odour temporarily with stronger overlay scents (perfumes, air fresheners, deodorant sprays), and the underlying odour molecules remain in porous materials. The masking wears off within days to weeks, and the original odour returns unchanged.

### Where They Differ

Odour elimination breaks down the molecules causing the odour at their chemical level using oxidation (hydroxyl radicals, ozone), enzymatic digestion of biological compounds, or physical removal and encapsulation of contaminated materials. The underlying odour source is neutralized rather than temporarily hidden.

Landlord and property manager situations particularly benefit from real elimination. Rental turnover with heavy tobacco odour, decomposition contamination, or pet urine issues will re-emerge in new tenant complaints if only surface treatment was performed. Real elimination protects the property from recurring turnover costs and tenant disputes.

### Where They Overlap

Real estate listing preparation requires elimination rather than masking. Buyer walkthroughs happen in variable conditions (humidity, temperature) that can reactivate odours from previous property use. Buyers who detect masked odour often walk away or negotiate significantly reduced prices.

Insurance-claim documentation requires elimination verification. Coverage on smoke, water, or biohazard damage typically requires post-work verification that the affected space is restored to pre-loss condition, not merely surface-cleaned.

### Which One You Actually Need

Our approach starts with source identification, physical removal of contaminated materials that cannot be treated in place, oxidation treatment with hydroxyl or ozone for residual molecules, and post-treatment verification through air-quality assessment before we sign off.

Transparent Pricing

## How Much Does Odour Removal Cost in Ottawa?

Every project is scoped on site and quoted in writing before work starts. These are the ranges most jobs land in.

### Single room

One room, source already removed.

Typical range $300 to $1,500

-   Hydroxyl or ozone treatment cycle
-   HEPA and carbon filtration
-   Surface treatment of hard finishes
-   Follow-up check included

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Most common

### Multi-room

Several rooms or shared HVAC spread.

Typical range $1,500 to $3,500

-   Multiple treatment cycles
-   HVAC and duct consideration
-   Thermal fogging where required
-   Porous material assessment

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### Full property

Whole-home saturation such as heavy tobacco or decomposition.

Typical range $3,500 to $6,000

-   Whole-property oxidation programme
-   Non-restorable material removal
-   Shellac-based primer sealing
-   Verification before handback

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Where the odour source is still present, removal is quoted separately from the odour treatment.

Assessments are free across Ottawa and Eastern Ontario, and nothing is added to the price mid-job. On covered claims we direct-bill most Ontario insurers.

Talk it through: 613-702-1799

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Why Choose Us

## Why Choose Extreme Cleaning Ottawa for Odour Removal?

### No perfume, ever

If a treatment smells like anything at handback, the source is still there. Ours smell like nothing.

### Source before treatment

We remove saturated material first. Skipping that step is why most odour jobs fail within a month.

### Occupied-space options

Hydroxyl treatment can run safely in occupied spaces where ozone cannot, which matters for tenanted units.

### Full-property capability

Heavy tobacco, decomposition, and animal urine saturation need whole-property programmes, not a rented machine.

Our Process

## How Our Odour Removal Work Runs

1.  01
    
    ### Find the source
    
    Odour is a symptom. We locate what is producing it, whether that is saturated underlay, subfloor, insulation, or duct residue.
    
2.  02
    
    ### Remove what cannot be saved
    
    Porous material that has absorbed the compounds is removed rather than treated, because treatment cannot reach the middle of a carpet pad.
    
3.  03
    
    ### Oxidise
    
    Hydroxyl generators or ozone shock treatment break the remaining volatile compounds apart at the molecular level.
    
4.  04
    
    ### Seal and verify
    
    Where residue has penetrated framing, we seal with shellac-based primer, then confirm the space reads neutral rather than scented.
    

Our Work

## Equipment, Method, Result

We never publish client scenes. These images show the equipment, the protective standards, and the restored condition we hand back.

 

## How Extreme Cleaning Ottawa Compares

| Feature | Typical provider | Extreme Cleaning Ottawa |
| --- | --- | --- |
| Method | Scent masking or deodorizer | Hydroxyl and ozone molecular oxidation |
| Porous material | Cleaned in place | Removed where non-restorable |
| Occupied spaces | Ozone only, vacate required | Hydroxyl option for occupied areas |
| Sealing | Skipped | Shellac-based primer where residue reaches framing |
| Result at handback | Smells of product | Smells of nothing |

Client Experiences

## What Customers Say About Our Odour Removal Work

Reviews from families, executors, and property managers across the region.

> The odour was completely gone, not masked. Hydroxyl treatment ran overnight, and months later there is still nothing lingering, which is more than I honestly expected.

Janet R.Kanata

> Cigarette odour saturated a rental property across ten years. They sealed the porous materials, ozone-treated the space, and it was rentable again inside a week.

Frederic O.Smiths Falls

> Cooking-oil stench had gone into the drywall and subfloor. They physically removed the source, treated everything, and there is zero olfactory trace now.

Wendy G.Casselman

Questions

## Odour Removal FAQs

### How much does odour removal cost in Ottawa?

Single-room treatment runs from about $300 to $1,500, multi-room work between $1,500 and $3,500, and full-property programmes between $3,500 and $6,000. If the odour source is still present, removing it is quoted separately, because treating around a source never holds.

### What is the difference between hydroxyl and ozone?

Ozone is more aggressive and works faster, but the space has to be unoccupied during treatment and ventilated afterwards. Hydroxyl generators work more slowly and can run safely in occupied areas, which makes them the right choice for tenanted units and homes people cannot leave.

### Why did my last odour treatment stop working?

Almost always because the source was still in the building. Compounds absorbed into carpet underlay, subfloor, drywall, or duct residue keep releasing after the treatment ends. Removing the saturated material first is what separates a permanent result from a temporary one.

### Can you remove cigarette smell from a whole house?

Yes. Heavy tobacco leaves nicotine tar and resin on every surface, including inside light fixtures and ductwork. Full-property treatment usually combines surface cleaning, oxidation, and shellac-based primer sealing of framing and ceilings before repainting.

### Do you handle pet urine odour?

Yes, and it is one of the harder ones. Urine salts crystallise in subfloor and re-activate with humidity, which is why the smell returns every summer in some homes. Treatment usually requires lifting flooring, treating the subfloor directly, then sealing.

### How long does treatment take?

A single room is often complete in one visit with a follow-up check. Multi-room and full-property work usually needs two to four days across multiple cycles, plus ventilation time where ozone is used.

### Is ozone safe for my home?

It is safe when the space is unoccupied during treatment and properly ventilated afterwards, which is exactly how we run it. People, pets, and plants must be out of the treated area. Where a property cannot be vacated, we use hydroxyl instead.

### Will you treat odour after a flood or fire?

Yes, and it is usually part of a larger scope. Smoke odour after a fire is handled within our fire and smoke damage restoration process, and post-flood musty odour is normally a moisture and mould issue that needs drying and remediation first.

### Still have questions?

Nothing you describe will surprise us, and nothing leaves the call. Talk to a real person any hour of the day.

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## Related Services

![Gloved hands carefully wrapping a recovered family keepsake during trauma scene cleanup](/images/misc/gloved-hands-carefully-wrapping-a-recovered-family.webp)

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Phone answered 24/7, same-day callback

## Ready to Talk About Odour Removal?

Free assessment, written quote before we start, and an unmarked crew that has done this work many times before.

Call 24/7: 613-702-1799

[tel:+16137021799 →](tel:+16137021799)

 

Request a Confidential Assessment

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-   Free assessment, written quote
-   Unmarked vehicles, neutral uniforms
-   Insurance direct billing on covered claims

Quick Message

## Get a Free Confidential Assessment

Send us a short message and a team member will call you back the same business day. Unmarked vehicles. Bilingual crews. No obligation.

### Thanks, we have your message.

A team member will call you back. If it is urgent, call 613-702-1799 now and someone will pick up.

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