Acidic soot residue starts corroding unprotected metal within roughly two days in New Hope, MN 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.
Using the wrong tool on either class tends to make the residue worse.
Local New Hope dispatch keeps that window from closing before we arrive.
A standard shop vacuum does the opposite of what's needed here.

Dry-chemical sponge work lifts embedded particulate without pushing it deeper.
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.
Both tracks get worked through to a final inspection you sign off on.
"Learning that porous and non-porous surfaces get treated completely differently was new information, but it made sense once explained." — Homeowner, New Hope
"Fast response on the metal fixtures meant we avoided the corrosion damage a slower crew might have missed." — Homeowner, New Hope, MN
"Watching them vacuum the carpet before doing anything wet made sense once they explained wetting soot-loaded fiber just sets the stain." — Homeowner, New Hope
Porous materials absorb soot into the surface itself; non-porous ones just hold it on top.
We test each surface individually rather than assuming one method works everywhere.
That window is a major reason response speed matters here.
Particulate removal and odor treatment are related but distinct services.
Skipping that order is the most common way carpet soot gets set in permanently.
Response times stay short across New Hope specifically because the corrosion window on metal fixtures doesn't wait.
