If it still smells, something is still there. We find it and remove it instead of spraying over it.
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Odor is information. It means residue is still present somewhere, in a wall cavity, in the ductwork, in the attic insulation, or in contents that were cleaned superficially.
Deodorization prices on the affected volume, the severity and type of residue, whether the HVAC system is involved, and how many days of treatment equipment the job takes. It is frequently part of a larger fire scope rather than a standalone service, but we do take standalone odor jobs, including long-term cigarette saturation and post-tenant odor in rentals.
Anything that adds a smell is not removing one. Scented foggers, odor bombs, and masking agents work on the same principle as air freshener: they add a stronger compound so your nose stops registering the weaker one. Your nose adapts within a day and the original odor returns, unchanged, because nothing about the source material was altered.
The order of operations is not negotiable: remove the source material, clean what stays, decontaminate the HVAC, treat the residual with hydroxyl or ozone, and only then seal what genuinely cannot be cleaned. Skipping to the end of that list is why odor jobs get done twice.
Smoke odor that will not leave? Call True Core. Source investigation, HVAC decontamination, hydroxyl and ozone treatment, verified results.
We find where the residue actually is, using inspection of cavities, ductwork, attic, and contents. Treatment without source removal is temporary by definition, and we will tell you when the answer is more demolition rather than more chemistry.
Hydroxyl generators break down odor compounds and are safe to run in occupied space, which matters when the house is livable and you do not want to move out for a week.
Ozone is more aggressive and reaches porous material hydroxyls cannot, but it is not safe to breathe. It runs only in sealed, vacated spaces with a documented airing-out period before anyone re-enters.
Thermal fogging produces a particulate that penetrates the same cracks, cavities, and porous surfaces the original smoke did, reaching residue that surface cleaning cannot.
The duct system distributed the smoke through the whole building and it will keep re-releasing odor every time the system runs. Cleaning the ducts and replacing filters is not optional on a smoke job.
We inspect where odor is strongest and trace it back. That usually means opening return plenums, pulling registers, checking attic insulation above the affected area, inspecting wall cavities on the smoke path, and checking under and behind cabinetry and appliances. Contents get evaluated separately, upholstery, mattresses, and stored textiles hold odor long after the structure is clean. This phase is diagnostic and it determines everything after. A company that skips it goes straight to fogging, which is why the smell comes back.
Residue-bearing material that cannot be cleaned comes out: saturated attic insulation, affected carpet pad, charred substrate. Everything else gets physically cleaned using the method appropriate to the residue type, dry sponge and HEPA vacuum for dry smoke, solvent cleaning for wet smoke, enzymatic for protein residue. This is the phase that actually removes odor. Every subsequent step is treating the fraction of residue that physical cleaning cannot reach.
Supply and return ducts get cleaned, the air handler and coil get cleaned, and filters get replaced. Until this happens the system re-introduces odor into every room each time it cycles, which makes it impossible to tell whether the rest of the work succeeded. On heavy smoke losses, flexible duct is often replaced rather than cleaned because the interior liner holds residue permanently.
With the source removed, treatment handles what is left. HEPA and carbon air scrubbers run throughout. Hydroxyl generators run in occupied or partially occupied spaces, typically over 24 to 72 hours. For heavier residual odor in spaces that can be vacated and sealed, ozone runs for a controlled period followed by a documented airing-out window before re-entry, nobody and no pets go back in until it clears. Thermal fogging is used where residue penetrated into cracks and cavities that no cleaning reached.
We let the space sit and then evaluate it with the HVAC cycling and the house closed up, which is when residual odor reveals itself. If any remains, we go back to step one on that area rather than moving to sealing. Sealing with a shellac-based encapsulant is a legitimate final step on framing and substrates where residue genuinely cannot be removed, but it is a last resort, not a shortcut. Used as a shortcut, it traps odor that eventually finds its way out.
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Because the source was never removed, only treated. Ozone and fogging neutralize what they reach, but residue sitting inside a wall cavity or in duct liner keeps off-gassing. Heat and humidity accelerate it, which is why the smell reappears on the first warm day. Recurrence is diagnostic: it tells you exactly that source material remains.
Not to breathe. Ozone is genuinely effective and genuinely a respiratory irritant, so it runs only in sealed, fully vacated spaces, with people, pets, and plants out, followed by a documented airing-out period before re-entry. Any company running ozone in an occupied home is doing something unsafe. When the space must stay occupied, hydroxyl is the correct tool.
Usually yes, and it is one of the harder odor jobs because decades of residue penetrate everything. Expect a thorough scope: cleaning or replacing porous surfaces, sealing framing, replacing HVAC filters and often flexible duct, and frequently replacing carpet and repainting after a sealing primer. Cleaning alone rarely resolves long-term smoke saturation.
Two to seven days for most smoke jobs, running concurrent with cleaning. Heavy structural fire odor takes longer and continues through reconstruction, since sealing and new finishes are part of the final result. Cigarette and protein-fire odor are the slowest.
It will help while it runs and it will not fix it. Consumer purifiers filter airborne particulate but do nothing about residue bound to surfaces and inside cavities, which is where the odor is actually coming from. It is treating the symptom at the lowest possible intensity.
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