Why free deodoriser is not free, and not deodoriser

What is physically being applied

When a company offers free deodoriser as a headline add-on, it is worth understanding what goes onto the carpet.

Most of these products are fragranced and designed to persist — persistence is the feature, because the customer judges the product by how long the smell lasts. Persistence in a carpet fiber means it does not rinse out easily and it is not volatile.

And it is applied at the end of the job. After any rinse. With nothing following it to extract it.

So the last thing that happens to the carpet is that a persistent, fragranced product is deposited into the pile and left there.

What residue does in a carpet

Sticky residue in a pile does exactly one thing reliably: it attracts and holds soil.

Dust sticks to it. Dirt sticks to it. And sand sticks to it, which is the part that matters most.

Sand that lands on clean fiber falls to the base of the pile, below where a shoe lands, where it does less damage and where a vacuum can reach it. Sand that lands on a residue film stays at the top of the pile — the exact height at which every footstep grinds it into the fiber.

That is the mechanism that moves abrasion from the base of the carpet to the wear surface, and it is what determines how fast a carpet dies.

A free additive that installs that mechanism is not free. The customer pays for it later, in fiber.

The odour is not being treated

Fragrance changes what you perceive. It does not change what is producing the smell.

If a house smells of animal, the source is organic material — usually urine that has soaked into the pad, plus the microbiology and oils an animal leaves on the fiber where it lies. Bacteria feeding on that material produce the odour, and they continue producing it under a layer of fragrance exactly as they did before.

So the room smells better for a week, and then the fragrance dissipates and the underlying odour is still being generated at the same rate. Most people describe this as the smell coming back. It never left.

Additive versus subtractive

There are only two approaches to odour and they are opposites.

Additive: put something on top that smells stronger than the problem. It is fast, cheap, and it does nothing to the source.

Subtractive: remove the material producing the odour. Map the deposits with UV, flood the area with enzyme in enough volume to reach the pad, draw it back out with extraction, and give the enzymes time to digest what remains.

The second one is what Spiker does, and it is slower, costs more, and is sold honestly as an attempt rather than a certainty. It is also the only one of the two that addresses anything.

Where enzyme fits, and why it is not the same thing

Spiker charges twenty-five dollars per room for pet enzyme treatment and it is required on every job where animals live in the home. That is a real charge for a real product, and the difference between it and a free deodoriser is worth stating plainly.

An enzyme is a biological agent that digests organic material. It is applied before cleaning, it needs contact time and moisture to work, and it is treating the microbiology and the bacteria-laden oils the animal actually deposited.

A fragranced deodoriser is applied after cleaning and masks perception.

One removes. The other covers. The fact that one is free and one is not is not a coincidence.

What to ask

Is anything being applied to my carpet after the rinse.

If so, what removes it.

Is this product treating the source of the odour, or the perception of it.

If the answer to the second question is nothing, the product is staying in the carpet.