Acidic soot residue starts corroding unprotected metal within roughly two days in Audubon, NJ 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.

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.
Acidic residue neutralized on faucets, hinges, and hardware before pitting starts.
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.
You see the plan split by surface class before approving anything.
Both tracks get worked through to a final inspection you sign off on.
"I didn't realize our drywall and our tile backsplash needed totally different cleaning approaches until they explained the classification step." — Homeowner, Audubon
"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, Audubon, NJ
"The HEPA extraction step before any wet cleaning turned out to be the reason our carpet actually came clean." — Homeowner, Audubon
Porous materials absorb soot into the surface itself; non-porous ones just hold it on top.
Classification happens before any cleaning tool comes out.
That window is a major reason response speed matters here.
Cleaning reduces odor, but persistent smell sometimes needs a separate treatment.
Yes, as long as HEPA extraction happens before any wet cleaning step.
Response times stay short across Audubon specifically because the corrosion window on metal fixtures doesn't wait.
