Urine found with a UV light, broken down with enzymes, and flushed out of the backing and pad — because odor that comes back every humid week was never removed, only covered.
Reviewed and updated .
Almost everyone who calls about pet odor has already tried something. Usually several things — a bottle from the supermarket, a rented machine, vinegar because the internet said so — and the smell went away for a week and came back. That is not bad luck and it is not because the products are fake. It is because the problem is not where the treatment went.
What you can see is the top of the carpet. What is causing the smell is often in the backing, the cushion underneath, or the wood below that. A surface stain the size of a coffee cup is routinely a contaminated area the size of a dinner plate once you look under the carpet, and no amount of cleaning the visible part reaches the rest of it.
Aiken makes this worse than it would be somewhere dry. Aged urine leaves salts that absorb moisture out of the air, so every humid stretch reactivates them and pushes odor and staining back to the surface. That is the mechanism behind “it only smells when it rains” — the smell was there all along, waiting for August.
Fresh urine is only mildly acidic, around pH 5 to 6, and if you catch it in the first few minutes it behaves like any other spill. What changes everything is time. Bacteria break the urea down into ammonia and the pH climbs, sometimes into strongly alkaline territory, and the residue left behind sets into uric acid crystals bonded to the fiber, the backing and the pad.
Those crystals are the reason this is a specialist job. They are water-resistant, so plain water, carpet shampoo and every deodorizer sold in a spray bottle simply do not dissolve them. You can clean the carpet perfectly and leave the crystals exactly where they were. They are also hygroscopic — they draw moisture from the air — and when they take up water they reactivate and wick both odor and staining back up to the surface.
The rising alkalinity has a second consequence worth knowing before you are quoted. High pH can destabilize carpet dye, particularly on acid-dyed nylon, which is what a great deal of residential carpet is. Where that has happened the color has been damaged rather than dirtied. The odor can be eliminated completely and a pale or discolored patch can still remain, and any cleaner who promises otherwise is guessing.
So there are three separate questions on a pet job, and they get separate answers: how deep did it go, can the odor be removed, and has the dye survived. More on why store products fail here.
Nobody can price a pet job honestly without knowing which of these it is.
| Level | Cost | What is happening down there |
|---|---|---|
| Level 1 Surface only | $40–$60 range of the add-on | Caught fresh and blotted. The urine is still in the face fiber and has not reached the backing. Standard extraction with an enzyme pre-treatment handles it and the odor does not come back. |
| Level 2 Into the backing | Mid-range of the add-on | Through the pile and sitting in the primary and secondary backing. Needs enzyme dwell time and sub-surface extraction to flush the dissolved salts out rather than pushing them around. |
| Level 3 Pad saturated | Top of the add-on, or quoted separately | Liquid has gone through to the cushion and spread. Treated with sub-surface flushing where the saturation is shallow; where it is heavy the pad section is replaced, because pad is the cheapest part of the floor and not worth saving. |
| Level 4 Subfloor reached | Quoted on inspection | The liquid is in the wood or concrete underneath. Carpet and pad come up in that area, the subfloor is treated and sealed, and new pad goes down. This is the step no home remedy can reach, and it is usually the difference between odor gone and odor back next August. |
The add-on range of $40–$100 covers levels one to three. Pad replacement and subfloor sealing are quoted after inspection because they are construction work rather than cleaning — see the pricing guide.
Cleaning figures are ours. Pad and carpet figures are published 2026 national ranges, so you can judge the arithmetic yourself.
| Item | Typical range | Notes |
|---|---|---|
| Pet treatment as an add-on to cleaning | $40–$100 | Covers levels one to three. Priced by number of spots and depth. |
| New carpet pad, installed | $0.75–$1.75 per sq ft | Published 2026 national range. A 12×12 room is roughly $100–$250 of pad. |
| Removing old carpet and pad | $0.70–$1.60 per sq ft | Includes labor and disposal. Only the affected section usually needs lifting. |
| Subfloor cleaning and sealing | Quoted on inspection | Depends on area and whether the deck is wood or concrete. Only needed at level four. |
| Recarpeting a 12×12 room, carpet and pad | $250–$1,100 | The number worth knowing before spending on treatment that will not save the floor. |
Why these sit on the same table: treatment only makes sense while it costs meaningfully less than replacing what is underneath. When it stops making sense, you should be able to see that for yourself rather than take our word for it.
A UV light shows urine deposits that are invisible in normal light, and the footprint underneath is routinely several times larger than the mark on top — a stain the size of a coffee cup on the surface can be the size of a dinner plate in the cushion. A moisture meter then says whether the pad and subfloor are still holding liquid. Guessing at this stage is how odor survives a cleaning.
Surface, backing, pad or subfloor. Where it matters, a corner of carpet is lifted to look — brown or yellow staining on the underside tells you what no amount of sniffing will. The depth decides the treatment and the price, and you are told which level you are dealing with before anything is agreed.
Aged urine leaves uric acid crystals that bond to fiber, backing and pad. They are water-resistant, so plain water, shampoo and supermarket deodorizers do not dissolve them — which is exactly why the smell returns. An enzyme treatment digests the organic source, and it needs real dwell time at the right temperature to do it.
Sub-surface extraction pushes solution through the carpet and pulls the dissolved salts back out of the backing and cushion, rather than cleaning the top and leaving the reservoir underneath. This is the step that stops wicking, and it is the main thing separating a pet treatment from a normal cleaning.
Shallow pad contamination is treated in place. Heavily saturated pad is cut out and replaced. Where liquid reached the subfloor, that surface is cleaned and sealed before new pad goes down, because an unsealed contaminated subfloor will keep releasing odor through whatever you put on top of it.
The pet treatment is followed by a full hot water extraction of the room so the treated area does not sit as a clean patch in dirty carpet, then airflow is set up. In Aiken's humidity, moisture left in a treated area is the one thing that can undo the work.
No line items appear for these.
Priced and agreed before work begins.
Odor coming from ductwork, walls or a litter tray is not carpet odor. If the carpet is not the source you will be told that rather than sold a treatment.
Including the ones sold as miracle fixes.
| Approach | Verdict | What it actually does |
|---|---|---|
| Enzyme treatment | Works, and it is the core of the job | Digests the organic residue that causes the odor. Needs the right pH, temperature and real dwell time — sprayed on and immediately extracted, it does almost nothing. |
| Controlled oxidizer | Works, on the right fiber | A measured hydrogen-peroxide system breaks down odor molecules and helps with discoloration. Requires a colorfast test first, because uncontrolled peroxide bleaches carpet permanently. |
| Sub-surface extraction | Works, and nothing replaces it | Flushes dissolved salts out of the backing and cushion instead of cleaning the top and leaving the reservoir. This is the step that stops the odor wicking back. |
| Encapsulant | Useful, but not for this | Crystallizes around soil so it can be vacuumed later. Good for commercial maintenance. It does not dissolve uric acid crystals and it does not reach a pad. |
| Deodorizer or “odor neutralizer” | Masks it | Adds a fragrance and often leaves residue. Legitimate as a finishing touch after the source is gone; sold as the treatment itself, it is a two-week fix. |
| Ozone generator | Not the answer, and not harmless | The EPA's assessment is that at concentrations within public health standards, ozone “has little potential to remove indoor air contaminants” and is not effective against many odor-causing chemicals. Effective levels exceed those standards, and inhaled ozone can damage the lungs and worsen asthma. It also does nothing about crystals sitting in a pad. |
| Pad replacement | Works, when saturation is heavy | Cheap relative to everything around it and the honest answer once cushion is soaked. Priced on area rather than as a cleaning add-on. |
| Subfloor sealing | Works, at the deepest level | Blocks a contaminated deck from releasing odor through whatever is laid on top. Only needed at level four, and no home remedy reaches it. |
The ozone line is worth stating plainly because ozone treatment gets sold for pet odor. The EPA's published assessment is that at concentrations within public health standards it has little potential to remove indoor air contaminants, and that reaching effective levels means exceeding those standards. We do not sell it.
It is a fair question and the honest answer is: for most healthy adults, saturated carpet is unpleasant rather than dangerous. For some households it is more than that, and it is worth knowing which one you are.
Ammonia. As urine decomposes it releases ammonia gas, and a heavily contaminated pad releases it continuously into the room. At household concentrations it is an irritant rather than a poison — eyes, nose, throat — but it is exactly the kind of low-level irritant that makes an asthmatic household worse without anyone identifying the cause. The strong smell in a closed-up room in an Aiken summer is the concentration climbing.
Bacteria and the pad. A damp, contaminated cushion under carpet is a growth medium, and it is one nobody ever inspects. That matters most in homes with crawling babies, immunocompromised residents, or anyone spending time on the floor.
Allergens generally. Pet dander and hair accumulate in carpet whether or not there have been accidents, along with the dust and pollen that come in with them. Carpet works as a filter, and a filter left long enough stops holding and starts releasing. Cleaning does not make a home allergen-free and nobody should claim it does — it empties the filter.
Mold. Repeated wetting of a pad in a humid climate is a genuine mold risk, and it is one reason a contaminated area should be dealt with rather than lived with. It is also why over-wetting during a cleaning is a real hazard here and why drying is treated as part of the job.
None of this is medical advice, and a carpet cleaner is not the right person to diagnose a respiratory problem. What we can say is which of the four levels your carpet is at, and whether there is a saturated pad under the room.
| What it is | Outlook | What is going on |
|---|---|---|
| Vomit | Usually removable, sometimes not | Bile is acidic and stomach contents often carry food dye. Both can strip or alter carpet color within hours, so speed matters more here than with almost anything else. |
| Feces | Removable, with proper sanitizing | The stain is the easy part. The job is removing the bacterial load, which needs extraction and a sanitizing step rather than a wipe and a spray. |
| Hairballs | Usually removable | Same problem as vomit — digestive acid plus whatever the cat ate. Left to dry they bond into the pile and need rewetting and agitation. |
| Embedded pet hair | Removable, and it is a vacuum job | Hair woven down into the pile does not come out with a household vacuum. It comes out with a proper pre-vacuum and agitation, which is part of every cleaning here rather than an add-on. |
| Tracked-in mud and Aiken sand | Removable | Paws bring in the same coarse sand that wears carpet from the inside out. Not a stain problem, a wear problem — see sandy soil in Aiken. |
| Blood | Often removable if handled cold | Cold water and blotting. Heat sets protein permanently, so hot water and steam mops are the two worst things to reach for. |
| Muddy paw prints on upholstery | Removable | Furniture the animal sleeps on holds dander, oils and odor as much as carpet does. Quoted as upholstery work. |
| Chewed or clawed carpet | Not a cleaning problem | Pulled loops, chewed edges and clawed thresholds are physical damage. They need repair or replacement, and you will be told that rather than quoted a cleaning. |
Vomit and blood are the two where acting in the first hour genuinely changes the outcome. Both respond to cold water and blotting, and both get worse with heat.
None of these are stupid. They just are not aimed at where the problem is.
Most add a fragrance over the top and leave a residue that attracts new soil to the exact spot you treated. The source is untouched, so the smell comes back the first humid week — and now there is a dirt magnet there too.
Vinegar is acidic and aged urine is alkaline, so it neutralizes some of the ammonia smell for a day or two. It does not dissolve uric acid crystals and it does not reach the pad. Baking soda sits on the surface and gets vacuumed away.
Peroxide does break down odor molecules, which is why professional systems use controlled peroxide — controlled being the word. Undiluted household peroxide on carpet with no colorfast test is how people bleach a permanent pale patch into a rug.
It puts water down and recovers only part of it. On a urine spot that is actively counterproductive: you have just added moisture to a reservoir of hygroscopic salts and given them something to wick upward with. The stain often looks worse a week later than before you started.
Heat can set protein staining permanently. Urine is protein-based, and there is a reason professional treatment starts with chemistry and dwell time rather than maximum heat.
Sometimes the right answer, but almost never a good first move. Without treating and sealing the subfloor, new pad over a contaminated deck smells within a season, and now you have a seam to repair as well.
| Cats | Dogs | |
|---|---|---|
| Volume per accident | Lower, but concentrated | Higher, and a large dog with a full bladder drives liquid straight through to the pad in one go. |
| Typical pattern | Repeated marking in the same spot — a corner, a doorway, the same side of a bed | One-off accidents scattered where the dog happened to be, or clustered near a door during house-training. |
| Why it matters | Repetition in one place is what saturates a pad and reaches a subfloor. A cat problem is usually deep and narrow. | A dog problem is usually wide and shallow, unless it went unnoticed or the dog is unwell. |
| Odor character | Sharper and more persistent. Concentrated urine means more uric acid per drop. | More diffuse, often noticed as a general smell in a room rather than a findable spot. |
| Hardest case | Chronic marking behind furniture that nobody looked behind for a year. | An older or incontinent dog sleeping in the same place every night. |
Practical upshot: a cat problem usually needs depth — sub-surface work, sometimes pad. A dog problem usually needs coverage. Tell us which animal and roughly how long it has been going on, and the quote will be much closer to the final number.
A fresh accident dealt with properly may never become a pet odor job at all. The window is short, so this is worth knowing before you need it.
What not to do: nothing from under the sink. Bleach destroys dye, ammonia-based cleaners smell like urine to an animal and can encourage repeat marking, and supermarket spot removers leave residue that turns the spot into a magnet for soil.
Three checks you can do before calling, which will make the quote much more accurate:
If the corner test is more than you want to do, that is fine — it is done as part of the inspection. But knowing the answer to the first two costs you nothing and takes a minute.
There is a point at which a pet job stops being a cleaning job, and you are better off hearing it before you pay for a treatment than after.
Where the dye is gone. Alkaline urine that has destabilized the dye has removed color, not added dirt. Odor treatment still works and the smell can go completely, but the pale or brown-edged patch stays. Sometimes that matters to you and sometimes it does not — either way it is your decision to make with the facts.
Where contamination is widespread. A dozen spots in one room, or years of marking across a whole floor, can reach the point where treating and replacing pad section by section costs more than recarpeting that room. When the arithmetic says that, you will hear the arithmetic.
Where the carpet is finished anyway. If the fiber is worn to the backing in the traffic lanes and the pad is contaminated, cleaning it is money spent on a floor that needs replacing. Worth cleaning to sell or to hand back a rental; not worth it to keep living on.
Where the source is not the carpet. Odor from ducts, from inside a wall, from a subfloor contaminated by a previous owner's pet under carpet since replaced, or simply from a litter tray, will not respond to cleaning carpet. Diagnosis first, treatment second.
It is an add-on to the carpet cleaning, normally $40 to $100 depending on how many spots there are and how deep they went. Surface treatment on a couple of fresh spots sits at the bottom of that. Where the pad has to be replaced or a subfloor sealed, that is quoted separately after inspection, because it is a different job from cleaning.
It can be removed permanently, but only if the treatment reaches as deep as the urine did. Odor comes back when the surface was cleaned and the reservoir in the backing, pad or subfloor was left in place. That is why the first step is finding out how deep it went rather than starting to spray.
Aged urine leaves hygroscopic salts — they pull moisture out of the air. When Aiken's humidity climbs, those salts absorb water, reactivate, and wick odor and staining back to the surface. The smell was never gone; the damp just made it detectable again.
On a fresh accident you catch and blot immediately, often yes. On anything older, rarely — the product has to reach the contamination, stay wet long enough to work, and then be extracted back out. Spraying the surface of a carpet whose pad is contaminated puts the enzyme nowhere near the problem.
As urine ages, bacteria break down the urea and it leaves uric acid crystals bonded to the fiber, the backing and the pad. Those crystals are water-resistant, so water, shampoo and deodorizers do not dissolve them. Breaking them down chemically is the whole job — everything else is masking.
A UV light makes urine deposits visible that are invisible in normal light, and a moisture meter tells us whether the pad and subfloor are still holding liquid. The contaminated area underneath is routinely several times bigger than the mark on the surface, which is the single most common reason a treatment misses.
Not always. Shallow contamination is treated in place with sub-surface flushing. Heavily saturated pad is cut out and replaced, because pad is the cheapest component of the floor and it is not worth trying to save once it is soaked. You will be shown what we found before that decision is made.
Where urine has gone through the pad into wood or concrete, that surface holds contamination and keeps releasing odor through anything laid on top. Sealing it after treatment blocks that. It is only needed at the deepest level of damage, and it is the step no home remedy can reach.
Often, but not always, and they are two different problems. Aged urine turns alkaline as it decomposes, and high alkalinity can destabilize carpet dye — particularly on acid-dyed nylon. Where the dye has been damaged the color is gone rather than covered, so the odor can be eliminated while a pale or discolored area remains. You will be told which you are looking at before work starts.
Different rather than simply worse. Cat urine is more concentrated and cats tend to mark the same spot repeatedly, so cat damage is usually deep and narrow — often reaching the pad or subfloor. Dogs deliver more volume in one go but scattered, so dog damage tends to be wider and shallower unless it went unnoticed.
The products are chosen with that in mind and the process flushes them back out rather than leaving them in the pile. Keep pets and children off the treated area until it is dry, which is normal for any wet floor. If a pet has a specific sensitivity, say so when booking.
It removes the scent marker that draws them back, which is a large part of the problem, and that alone resolves a lot of repeat marking. It is not behavior training though. If a cat has started marking suddenly, a vet visit is worth more than a carpet cleaning — sudden marking is often a urinary tract problem.
Blot a fresh accident immediately with a white cloth, pressing rather than rubbing, and plain cold water is safer than anything under the sink. Beyond that, stop. Supermarket products leave residue that attracts soil, and a rented machine adds moisture to salts that then wick upward, which frequently makes the stain look worse than it did.
Enzyme dwell time means a pet treatment adds time to the visit rather than being instant — allow longer than a straight cleaning. Drying is four to eight hours as usual, and treated areas get airflow directed at them because moisture left in a treated spot is the one thing that can undo the work.
Not with certainty over the phone, because depth is what decides it and depth is not audible. What you will get is an honest range and the levels explained, then a definite answer once it has been looked at. If the answer is that the carpet needs replacing rather than cleaning, you will hear that instead of a quote.
Not reliably, and it is not harmless. The EPA's published assessment of ozone generators is that at concentrations within public health standards ozone has little potential to remove indoor air contaminants and is not effective against many odor-causing chemicals, and that effective levels exceed those standards. Inhaled ozone can cause chest pain and coughing and can worsen asthma. It also does nothing about uric acid crystals sitting in a pad, which is where the odor is coming from.
For most healthy adults it is unpleasant rather than dangerous. Decomposing urine releases ammonia, which is an irritant to eyes, nose and throat and can make an asthmatic household worse without anyone identifying the cause. A damp contaminated pad is also a growth medium, which matters more in homes with crawling babies or anyone immunocompromised. This is general information, not medical advice.
It removes a large part of what accumulates — dander, hair, dust and pollen tracked in on paws. Carpet works as a filter and cleaning empties it. It does not make a home allergen-free, and any cleaner claiming otherwise is overselling.
Yes. Vomit is often the more urgent one, because bile is acidic and stomach contents frequently carry food dye, and both can alter carpet color within hours. Feces is straightforward to lift but needs a sanitizing step rather than just extraction. Hairballs left to dry bond into the pile and need rewetting and agitation.
Yes, and it is not an add-on. Hair woven down into the pile does not come out with a household vacuum — it needs a proper pre-vacuum with agitation, which is part of every cleaning. Heavily shedding households are the main reason a pre-vacuum takes longer than people expect.
New pad installed runs roughly $0.75 to $1.75 per square foot on published 2026 national figures, so a 12 by 12 room is about $100 to $250 of pad. Removing old carpet and pad is another $0.70 to $1.60 per square foot. Usually only the affected section needs lifting rather than the whole room.
When treatment plus pad work starts approaching the cost of recarpeting the room, which for a 12 by 12 room with new carpet and pad is roughly $250 to $1,100. A dozen spots across one room, or years of marking, often crosses that line. You will be shown the arithmetic rather than talked into the treatment.
Judge it once the area is fully dry, not while it is damp — damp carpet smells of damp carpet. Give it a few days, and specifically check it on the first humid day, because that is when a missed deposit will announce itself. If it does, call rather than waiting.
Pet urine that reached the pad is generally damage beyond normal wear and tear, and it is the most common legitimate deposit deduction there is. What a landlord cannot usually do is charge full replacement cost on carpet that already had years of use behind it. The move-out page covers wear versus damage and how proration works.
That plus roughly how many spots gets you a straight range on the phone — and an honest answer about whether the stain will come out along with the smell.
Rather write? Email carpetcleaningaiken@gmail.com.
