Three kinds of soot, three different cleanups
What burned determines how we clean. Dry soot, from fast, hot fires burning wood and paper, sits powdery on surfaces and lifts with chemical sponges. Wet soot, from slow smoldering fires and burning plastics, is greasy, smeary, and ruins anything cleaned with the wrong method first. Protein residue, from kitchen and grease fires, is nearly invisible but discolors paint and varnish and carries the most stubborn odor in the business. Puff-back from a furnace malfunction behaves like an oily hybrid of all three.
This is why the outcome of a smoke claim is decided in the first pass. The wrong first pass sets stains that only repainting and refinishing can fix, and turns cleanable contents into replacements.
Our cleanup sequence
- Test and classify the residue
Chem-sponge tests in each affected room tell us soot type and spread pattern, including rooms that look clean but test dirty.
- Protect and pre-clean
Corrosion inhibitor on metals, protective covering on traffic paths, and dry-sponge lifting of loose soot before any wet method touches a surface.
- Scrub the air
Negative-air HEPA machines exchange room air continuously, pulling particulate you would otherwise breathe and re-deposit for months.
- Clean by surface and soot type
Dry sponge, then appropriate wet agents, degreasers for wet soot, enzyme treatment for protein residue. Ceilings first, floors last.
- Handle the ductwork
HVAC runs during a fire distribute soot house-wide. We clean or seal duct runs so the system stops re-contaminating finished rooms.
- Neutralize odor
Thermal fogging recreates the smoke's penetration path with counteractant. Ozone or hydroxyl generators break odor molecules apart; sealing primers lock treated structural surfaces.
Why the smell comes back on humid days
Smoke odor lives in porous material: unsealed wood framing, insulation, drywall paper, carpet pad. Humidity re-opens those pores and re-releases odor molecules, which is why a house that smelled fine in March smells like the fire again in July. Masking agents and consumer ozone rentals do not reach framing cavities. Persistent odor removal means removing what cannot be cleaned (usually charred material and some insulation), fogging what can, and sealing structural wood with an odor-blocking primer before reconstruction closes the walls.
Chicago housing realities
Chicago's housing stock changes the job. Brick two-flats and courtyard buildings share utility chases that carry smoke to neighboring units; balloon-framed pre-war houses let smoke rise inside wall cavities from basement to attic; plaster walls hold odor differently than drywall and reward different cleaning methods. In winter, a closed-up house concentrates residue, and negative-air setups need managed makeup air so we are not pulling minus-ten-degree outside air across your plumbing. We work these buildings every week across the city, DuPage, and Will County.
What you can safely do today
- Open windows if outdoor temperature allows; ventilation dilutes airborne particulate.
- Keep HVAC, ceiling fans, and bathroom fans off.
- Move uncontaminated valuables to a clean room and close the door.
- Photograph every room before touching anything; your claim depends on it.
- Skip store-bought soot cleaners, sprays, and candle masking. They cost real money in set stains later.
