Acidic soot residue starts corroding unprotected metal within roughly two days in Baltimore, MD conditions, which is why classification happens fast, not as a leisurely first step.
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Treating both classes the same way is the most common soot-cleanup mistake.
Dry-chemical sponges for porous materials, solvent agents for non-porous ones.
Metal fixtures get attention early since acidic residue starts pitting fast.
Fine particulate captured rather than recirculated back into the air.

Sponges get rotated out constantly since a loaded sponge starts redepositing soot.
HEPA extraction pulls particulate before any wet cleaning ever touches the fiber.
A completely different chemistry than what porous drywall responds to.
This track gets prioritized first because the corrosion clock doesn't pause for anything else.
Sequencing matters as much as the cleaning technique itself.
A property can look clean and still be recirculating particulate through the ducts.
A technician answers and mobilizes the nearest available crew.
Crews arrive carrying tools for both the porous and non-porous tracks.
Every surface gets classified and priced before any cleaning starts.
The job isn't finished until every classified surface has been addressed.
"Learning that porous and non-porous surfaces get treated completely differently was new information, but it made sense once explained." — Homeowner, Baltimore
"Fast response on the metal fixtures meant we avoided the corrosion damage a slower crew might have missed." — Homeowner, Baltimore, MD
"The HEPA extraction step before any wet cleaning turned out to be the reason our carpet actually came clean." — Homeowner, Baltimore
The wrong method on either class tends to spread or set the residue worse.
We test each surface individually rather than assuming one method works everywhere.
Roughly two days under typical conditions, which is why we prioritize metal early.
Particulate removal and odor treatment are related but distinct services.
Yes, as long as HEPA extraction happens before any wet cleaning step.
Response times stay short across Baltimore specifically because the corrosion window on metal fixtures doesn't wait.
