Dander
Shed skin, not hair — which is why removing the hair does not remove the smell, and why the vacuum can become the source.
In detail
Material shed from the skin of animals with fur, hair or feathers, and from people; dandruff is the human word for it. It is distinct from pet hair and behaves differently: it is fine, it settles everywhere rather than into the pile, and it carries the odour that a household eventually stops noticing and a visitor does not. Two things about it are counter-intuitive. The smell gets STRONGER after cleaning and in humid weather, for the reason every embedded odour does — warmth and moisture make it more evident. And the vacuum becomes a source: hair and dander left in the machine decompose, and the exhaust distributes the smell, which is why the professional instruction is to empty it after every use rather than when full. Removing it is a whole-house job. It settles on virtually every absorbent item, so cleaning the carpet alone leaves most of it, and where it has reached the backing or beyond, replacement may be the only complete answer. The controls are ordinary: brush the animal weekly, change ventilation filters, damp-dust so particles are captured rather than relaunched, wash pet bedding, and use a sealed, finely filtered vacuum.
Sources for this page
Sources
Consumer Floor and Furnishings Care Information: carpet topics
Institute of Inspection, Cleaning and Restoration Certification (IICRC) · Trade or professional body
Relied on for: That dander is material shed from animals with fur, hair or feathers and from humans, like dandruff; that its odour intensifies after cleaning and in humid conditions; that hair and dander left in a vacuum decompose and cause strong odours from the exhaust; that removal means cleaning virtually all absorbent items, with replacement the only answer where it reaches the backing. (states this directly)
Verification: a person has read the passage relied on.
Read on — All twenty-five numbered topics. The damage sections (17-25) and the animal, mould and residue sections carry most of what was new. Supports a wider statement — our claim was widened. The single richest source this register has acquired. It supplies six mechanisms nobody here held — wicking, cellulosic browning, filtration soiling, rapid re-soiling, delamination and phenolic yellowing — and every one of them is a case of DIRTY VERSUS DAMAGED, the distinction this catalogue is built on. It also closes the pet-odour question Sprint 48 left partial: the reason the smell returns in humid weather is a reservoir in the backing and padding that surface cleaning never reached, not the rehydrating uric-acid story consumer pages tell.
Last reviewed by a person on .