“Can cleaning product residue in carpet cause problems after professional cleaning?
The short answer is absolutely! And after more than 56 years in the carpet and upholstery cleaning business, I can tell you that the type of cleaning product used, how it is applied, and how much of it is removed can make a tremendous difference in how clean your carpet or upholstery stays after cleaning.
Think About How We Clean Other Things
Consider some of the everyday things we clean.
When you shampoo your hair, you work the shampoo through your hair and then rinse it out. When you wash dishes in a sink of hot, soapy water, you rinse them afterward. Your washing machine has a rinse cycle to remove detergent from your clothes, and your dishwasher rinses away the detergent and loosened food before the drying cycle.
Even when you take your car through a car wash, the process involves applying cleaning agents, loosening the dirt, and rinsing the surfaces.
Why do we rinse?
Because cleaning products are designed to help loosen, dissolve, or suspend the soil, grease, oils, and other contaminants we want to remove. Rinsing helps carry away the loosened soil along with the cleaning solution.
Now imagine what would happen if you didn’t rinse the shampoo out of your hair, the soap off your dishes, or the detergent out of your clothes.
Carpet and upholstery are no different. Cleaning agents can be necessary to achieve good cleaning results, but what happens to the cleaning solution after it has done its job is just as important.
Some cleaning formulations rinse away more easily than others. The amount used, the type of product, the cleaning method, and the effectiveness of the rinsing process all influence how much residue may remain.
How Carpet Cleaning Was Done in the 1960s
When I started in this business, carpet and upholstery cleaning was often performed using a shampoo method, much like shampooing your hair today.
The cleaning solution produced a lot of foam. The detergents helped loosen the soil and hold it in suspension so it could be removed.
The problem was that we didn’t have the sophisticated extraction equipment available today to thoroughly rinse carpets and upholstery.
We used a wet vacuum to remove as much of the wet, sudsy solution as possible. That removed some of the loosened soil, too, but it was difficult to remove all the cleaning solution from the fibers.
As a result, some carpets and upholstery were left with detergent residue.
Certain residues can attract soil, particularly when they leave a sticky film on the fibers. This can cause the material to become soiled again more quickly than expected.
For example, a carpet that previously took a year to reach a certain level of soiling might appear just as dirty after only six months following a cleaning that left substantial residue behind.
Of course, the actual time depends on foot traffic, the type of carpet, household conditions, and other factors. But the principle is important: cleaning a carpet is one thing; cleaning it in a way that helps it stay clean is another.
How Carpet and Upholstery Cleaning Has Improved
Today, we have much more sophisticated equipment that allows us to rinse and extract cleaning solutions and loosened soil from carpet and upholstery far more effectively.
There are several different cleaning methods, and each works a little differently.
Some methods involve applying a cleaning solution, allowing it to work, and then rinsing and extracting it. Depending on the material and the cleaning method, agitation may also be used to help loosen soil.
For upholstery, I have used a detergent with an ammonia base for many years. The particular formulation I use has the advantage of being volatile, meaning it can evaporate rather than remain behind as a persistent detergent film. The formulation and how it is used matter, of course; not every ammonia-based product behaves the same way.
The goal is to remove the soil without leaving unnecessary cleaning residue behind.
What About Bonnet Carpet Cleaning?
Bonnet cleaning is a little different.
In this method, a cleaning solution is applied to the carpet’s surface. A rotary machine then spins an absorbent pad over the carpet.
The pad may combine cotton fibers, which absorb moisture and soil, with synthetic fibers such as nylon. The machine’s action helps transfer soil to the pad, while friction can generate heat and help the carpet surface dry more quickly.
Bonnet cleaning is primarily a surface-cleaning method. It can improve the overall appearance of carpet and offer relatively quick drying, but it does not provide the same type of deep rinsing and extraction as a properly performed hot-water extraction process.
Depending on the cleaning product and the amount applied, some detergent may remain in the carpet.
Many bonnet-cleaning products claim that their detergent crystallizes as it dries, allowing the residue to be removed by vacuuming.
I was curious about those claims, so I tested a number of these products myself. I mixed each product according to its instructions and placed a few drops on a mirror to dry.
In my tests, the dried samples left a visible film or residue rather than forming the easily removable crystals I expected. That doesn’t establish how every product performs on carpet, but it made me question whether the claims fully explained what was happening.
A Real-World Example: The Carpet That Took Three Cleanings
I remember a job from many years ago that really drove home the problem of detergent buildup.
A woman had been using a do-it-yourself spray-foam carpet cleaner. Each time she cleaned the carpet, it seemed to become soiled more quickly.
Eventually, she called me to have the carpets professionally cleaned.
Within seconds of beginning the extraction process, I was shocked to see my machine’s waste tank filling with thick foam. The carpet contained so much residual cleaning product that the foam became a major problem.
Fortunately, I had a product called a defoamer, which is designed to control foam during extraction. Even with the defoamer, the job took perhaps three times longer than I would normally have expected.
I explained the problem to the homeowner and told her I was curious about how much detergent was still in the carpet. I asked if she would mind letting me use her carpet as an experiment.
I offered to return the following week and clean it again at no charge. This time, I would rinse the carpet with hot water without adding any cleaning detergent. I wanted to see whether more of the accumulated residue could be removed.
She was delighted with the offer.
I returned as promised and performed the additional rinse. I then returned a third time and repeated the process.
After those three cleaning visits, I estimated that I had removed perhaps 90% of the detergent residue, although I was still extracting a little more.
That percentage was my estimate, not a laboratory measurement. Nevertheless, the experience demonstrated just how much cleaning product can accumulate in carpet when it is repeatedly applied without being adequately removed.
It also showed me why simply adding more cleaning solution is not always the answer.
The Bottom Line: More Cleaning Product Does Not Mean Better Cleaning
Cleaning agents serve an important purpose. They help loosen soil, oils, grease, and other contaminants so they can be removed.
But the job isn’t necessarily finished when the soil has been loosened. The remaining solution must also be removed, managed appropriately, or, where the formulation is designed for it, allowed to dry without leaving an undesirable residue.
This is why the cleaning method, the product formulation, the amount applied, and the ability to rinse or extract the solution are all important.
If your carpet or upholstery becomes sticky after cleaning, seems to attract dirt unusually quickly, or has been repeatedly treated with do-it-yourself cleaning products, detergent residue may be one possible explanation. Other factors can cause similar problems, so the symptoms alone don’t prove that residue is responsible.
After more than 56 years in the business, I’ve learned that good cleaning isn’t simply about removing the soil you can see today. It’s also about choosing a method that helps prevent cleaning itself from contributing to tomorrow’s problem.
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If you have questions about carpet or upholstery cleaning, or if your carpet seems to attract dirt unusually quickly after cleaning, we would be happy to help. With more than 56 years of hands-on experience, Alec’s Carpet & Upholstery Cleaning can help you understand what may be happening and recommend an appropriate cleaning approach.
Learn more about our professional carpet cleaning and professional upholstery cleaning services, or contact us to discuss your particular situation.
Alec Houle
Alec’s Carpet & Upholstery Cleaning LLC
Serving Greater Boston, the South Shore, MetroWest, and Cape Cod since 1970.