Acidic soot residue starts corroding unprotected metal within roughly two days in Baltimore, OH 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.
Acidic residue neutralized on faucets, hinges, and hardware before pitting starts.
Ceilings get worked before walls so falling particulate doesn't recontaminate finished surfaces below.
A property can look clean and still be recirculating particulate through the ducts.
A technician answers and mobilizes the nearest available crew.
No return trip needed once the surface classification is done.
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, Baltimore
"They got to our kitchen faucet fast enough that it never even started pitting, which the adjuster said was lucky timing on our part." — Homeowner, Baltimore, OH
"Watching them vacuum the carpet before doing anything wet made sense once they explained wetting soot-loaded fiber just sets the stain." — Homeowner, Baltimore
Porous materials absorb soot into the surface itself; non-porous ones just hold it on top.
Classification happens before any cleaning tool comes out.
Roughly two days under typical conditions, which is why we prioritize metal early.
Cleaning reduces odor, but persistent smell sometimes needs a separate treatment.
Skipping that order is the most common way carpet soot gets set in permanently.
Response times stay short across Baltimore specifically because the corrosion window on metal fixtures doesn't wait.
