Decomposition odor can persist when fluids or other affected material have penetrated porous surfaces. The first task is not masking the smell; it is identifying and addressing the contamination that is producing it.
Materials can hold odor
Carpet, padding, upholstery, subfloor, unfinished wood, drywall, and contents can absorb fluids and odor-causing compounds. Depending on the scene, some materials may need to be removed before odor treatment is effective.
See also decomposition cleanup.
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Call and tell us what happened and which part of the property is affected.