Acidic soot residue starts corroding unprotected metal within roughly two days in Hunt Valley, 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.
Using the wrong tool on either class tends to make the residue worse.
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.
Sequencing matters as much as the cleaning technique itself.
Vents and returns cleaned on the same visit since they keep redistributing soot otherwise.
A technician answers and mobilizes the nearest available crew.
No return trip needed once the surface classification is done.
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, Hunt Valley
"Fast response on the metal fixtures meant we avoided the corrosion damage a slower crew might have missed." — Homeowner, Hunt Valley, MD
"Watching them vacuum the carpet before doing anything wet made sense once they explained wetting soot-loaded fiber just sets the stain." — Homeowner, Hunt Valley
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.
Yes, as long as HEPA extraction happens before any wet cleaning step.
Response times stay short across Hunt Valley specifically because the corrosion window on metal fixtures doesn't wait.
