Tech — Patent Read

The Word “Microfiber” Tells You Less Than You Think

Name: Binx Professional Cleaning
Address: 1315 Hammond Street, North Bay, ON, P1B 2P2, CA
Telephone: (705) 845-0998
Price range: $80–$150

An operator's read of US7302733B2 — a floor machine built on the premise that the moistened cloth does the cleaning, not the chemical — and of the hospital-cleaning studies showing why two cloths with the same label can perform very differently.

Published September 28, 2026 · Binx Professional Cleaning

Macro illustration of a blue microfiber cleaning cloth lifting soil from a hard floor, with callouts showing a split fibre's wedge-shaped segments trapping particles and a cross-section of the segmented fibre — Binx Professional Cleaning — A split microfiber is a bundle of wedge-shaped filaments. The gaps and edges between them do most of the work, and nothing on the label tells you how well they were made.

Of all the technology in a commercial cleaning operation, the one our crews handle most is the one nobody thinks of as technology. It isn't the autoscrubber or the electrostatic sprayer. It's the microfiber cloth, and a cleaner goes through dozens of them in a single night.

Microfiber's reputation is so settled that the word has become a buying specification. Procurement orders "microfiber," the supplier ships something labelled microfiber, and everyone assumes the question has been answered. It hasn't. The word describes how thin a fibre is. It doesn't describe how well the cloth made from it cleans, and the research on that point is unusually blunt.

Our anchor for this one is a machine rather than a cloth. US Patent 7,302,733, "Floor cleaning machine using microfiber pad," was filed by Minuteman International Inc, the commercial floor-equipment maker, with a priority date of 9 September 2004. It was granted on 4 December 2007 to inventors Michael A. Rau, Jesse V. Mondigo, David R. Holly and Jeffrey W. Pollack. It sits on Google Patents at patents.google.com/patent/US7302733B2, listed as Expired – Fee Related: the twelve-year maintenance fee went unpaid and the patent lapsed effective December 2019. What makes it worth reading is less the machine than the premise underneath it.

What Does “Microfiber” Actually Mean?

The patent gives a definition, and it's a useful one to start from precisely because it's so loose. As used in the filing, the term "microfiber" is "intended to be broad, including ultra-fine manufactured fibers having a weight of less than approximately 1.0 denier." It then lists acrylic, nylon, polyester and rayon as the materials microfiber fabrics are currently made from, "but the term as used herein is not limited to these materials."

Denier is a textile unit of linear density: the mass in grams of 9,000 metres of a single fibre. A fibre under one denier is extremely fine, finer than silk. That is the whole of the definition. It says nothing about the polymer, nothing about the cross-sectional shape of the fibre, and nothing about whether the fibre has been split.

Splitting is what cleaning microfiber actually depends on. Commercial cleaning cloths are typically made from a bicomponent filament, usually polyester and polyamide (nylon) extruded side by side in a segmented cross-section, like the slices of a pie. After the fabric is made, a mechanical or chemical process separates those segments into individual wedge-shaped filaments. One filament becomes a bundle of much finer ones, each with sharp edges and narrow channels between them. The inset in the illustration above shows the idea.

A cloth can meet the dictionary definition of microfiber without any of that engineering, or with a poor version of it. That's the gap the rest of this article is about.

Why Does Split Microfiber Lift Dirt That Cotton Pushes Around?

Three things happen when a well-made split microfiber cloth crosses a surface.

First, surface area. Splitting multiplies the amount of fibre surface in a given weight of cloth, so there is simply more material in contact with the soil. Second, capillary action. The narrow channels between the fine filaments wick liquid, and the suspended soil in it, up into the cloth and away from the surface. Third, mechanical removal. The wedge edges get under films and particles that a round, thicker fibre rides over.

Cotton works differently. Its fibres are far coarser and absorb liquid into the fibre itself, and a loaded cotton cloth or string mop readily redeposits what it picked up. It tends to move soil across a surface as much as it lifts it off.

The clearest field demonstration is a 2007 study from the University of North Carolina by Rutala, Gergen and Weber (American Journal of Infection Control 35:569–573). Across twenty-four patient rooms per condition, a microfiber mopping system removed 95% of floor micro-organisms when used with a plain detergent cleaner, against 68% for a conventional cotton string mop. Then comes the result that matters for this series: adding a disinfectant to the microfiber system made no difference (95% vs 95%), while adding it to the cotton mop raised it to 95%. In other words, the microfiber was achieving by physical removal what the cotton mop needed chemistry to reach.

Why Would Anyone Build a Floor Machine Around a Cloth?

That result is essentially the design premise of the Minuteman patent. The machine sweeps a vacuum pickup across the floor first to take up loose debris, then drives a pair of microfiber pads behind it in a reciprocating or oscillating motion. It meters just enough solution to keep the pads damp, and it redirects the filtered vacuum exhaust onto the floor behind the machine to dry off whatever moisture is left.

The patent is explicit about which component is doing the cleaning. The solution's purpose, it says, is "to keep the contact surface of the microfiber fabric moist, but not dripping wet. It is the moistened microfiber fabric itself which does the primary cleaning." Because so little liquid goes down, the design doesn't need the recovery squeegee and dirty-water tank of a conventional autoscrubber, and people can walk on the floor straight away.

A floor-equipment manufacturer designing a machine around the textile rather than the chemistry is a telling bet. It's the same bet housekeeping departments were making at the time when they swapped string mops for flat microfiber pads. And it carries an obvious risk: if the cloth is doing the primary cleaning, the quality of the cloth is the whole product.

Does the Microfiber Label Tell You How Well a Cloth Cleans?

No, and the researchers who tested it said so in plain words.

In 2006, Moore and Griffith at the University of Wales Institute, Cardiff compared six microfiber cloths with paper towel and a conventional cloth, measuring both organic soil (by ATP) and bacteria (Journal of Hospital Infection 64:379–385). Used damp on a dry surface, the microfiber cloths' performance was variable and, in most cases, not significantly better than paper towel or a conventional cloth. One cloth stood out, clearly beating the others and paper towel on both soil and microbial load. Used dry, none of the cloths reduced the bioburden effectively. Some microfiber cloths also put noticeably less soil and fewer organisms back onto a surface than others. Their conclusion: "Different makes of microfibre cloths have different characteristics, and the name 'microfibre' should not imply superior cleaning efficacy."

Five years later, Smith, Gillanders, Holah and Gush at Campden BRI ran a larger test: ten microfiber cloths on stainless steel, laminate and ceramic tile against MRSA, E. coli and C. difficile spores (Journal of Hospital Infection 78:182–186). The differences between cloths on first use were statistically significant, but among the nine reusable cloths they were small in practice, under one log reduction. The one disposable microfiber cloth performed notably worse. And one line from the abstract belongs on every janitorial purchase order: "For all cloths, price was not an indication of performance."

Put the two studies together and a fair reading is this. Good microfiber is genuinely good, often better than the alternatives. But "microfiber" is a category that includes both good and mediocre products, you can't tell them apart by the label or the price, and a cloth used dry is barely cleaning at all.

Why Does a Cloth Clean Worse as the Shift Goes On?

The Campden study found something that anyone who has watched a cleaner work a room will recognise: the performance of every cloth decreased with repeated use on a succession of contaminated surfaces.

This follows directly from how the cloth works. The capillary channels and filament edges that pull soil off a surface have a finite capacity. Once a face of the cloth is loaded, it picks up less, and it starts to redistribute what it's already holding. At that point the cloth is carrying contamination from the last surface to the next one, and a cleaning tool has become a way of spreading it.

This is why microfiber programmes are really handling programmes: folding to create several fresh faces, turning to a new face at defined points, changing cloths between areas instead of rinsing and carrying on, and colour-coding so a cloth from one kind of area never reaches another. None of that is fussiness. It's the practical response to a measured property of the material.

Does Microfiber Wear Out in the Wash?

This is the part most often told as a simple story, "microfiber degrades with laundering." The literature says something more interesting.

Researchers at the Medical University of Vienna, Diab-Elschahawi and colleagues, compared microfiber, cotton, sponge cloth and disposable paper towel against S. aureus and E. coli in a blood-and-protein test soil (American Journal of Infection Control 38:289–292). New microfiber gave the best results. After 10 and 20 reprocessing cycles at 90 °C for five minutes, cotton showed the best overall efficacy. The authors recommended choosing cleaning cloths by their performance after repeated reprocessing, not when new.

The Campden study, however, found the opposite trend over a longer run. Its reusable cloths actually performed better after 75 washes, dropped back after 150, and in most cases were still better at 150 washes than on their first use.

Then in 2022, Fulenchek and colleagues at Texoma Medical Center in Texas addressed the disagreement directly (American Journal of Infection Control 50:1274–1276). They pointed out that the existing studies "lack[ed] standardized laundering parameters," and showed that microfiber cloths and pads laundered according to CDC laundry parameters removed microbes about as well as new ones.

So the honest answer to "does microfiber wear out in the wash?" is that it depends on the wash. The variable is the laundry protocol, meaning temperature, chemistry and drying, more than the number of cycles. Most microfiber manufacturers' care instructions warn against high heat, chlorine bleach and fabric softener, all of which can damage or clog the fine filaments the cloth depends on. A microfiber programme is therefore only as good as the laundry behind it, and that laundry is often the least supervised part of the operation.

Is a Microfiber Cloth a Disinfectant?

No. Microfiber removes soil and micro-organisms. It doesn't kill them, and the distinction matters for the same reason it did in our read of silver antimicrobial mop heads. The silver in a treated mop head is there to protect the textile. The fibre architecture of a microfiber cloth is there to lift soil off the surface. Neither is a disinfection step, and neither should appear on a scope of work as one.

The two jobs can also interfere with each other. In 2016, Boyce and colleagues in Yale New Haven Hospital's infection-control and environmental-services departments reported that microfiber wipers, cotton towels and one of two types of disposable wipe, soaked in a quaternary-ammonium (quat) disinfectant, showed significant binding of the disinfectant (Infection Control & Hospital Epidemiology 37:340–342). A cloth sitting in a bucket of quat solution can hold back part of the active ingredient, so what reaches the surface may be weaker than what was mixed. That is the same "measured dose for a measured time" problem we've come back to throughout this series, with electrostatic sprayers and on-site hypochlorous acid. This time the thing diluting the dose is the cloth itself.

The practical consequence is that microfiber and disinfectant have to be chosen as a pair. The disinfectant's label concentration assumes the solution reaches the surface at that strength. Whether it does through a given cloth is something to check with the chemical supplier, not something to assume.

What Binx Actually Does

Microfiber is our default cleaning textile, and we'd make the same choice again. The Rutala result is the reason: in routine cleaning, a good microfiber system removes most of what's on a surface by physical action alone, and removing soil is most of what cleaning is.

What the research changed for us is how we treat it. We don't buy on the word "microfiber" or on price. Both of those, per the Cardiff and Campden studies, predict very little. We use cloths damp, not dry. We fold them for fresh faces and change them between areas rather than rinsing and carrying on, because the Campden data says a loaded face is a transport mechanism. We colour-code, so that a cloth from a washroom is never the cloth that reaches a breakroom counter. And we treat laundering as part of the cleaning process, not something that happens after it, because the 2022 work is clear that the wash protocol, more than the cycle count, decides whether a reprocessed cloth still performs.

Disinfection stays a separate, documented step under our disinfection and sanitization protocol: a registered product, at label concentration, for the label contact time, applied with a textile we know is compatible with it. That matters most in healthcare settings, where every one of the studies above was carried out, and where "which cloth, laundered how" is a fair question for an infection-control lead to ask their cleaning contractor. The same thinking goes into our janitorial supply choices and our floor care programmes.

Binx Professional Cleaning services commercial, educational and healthcare facilities across North Bay and Sudbury. Talk to us about a cleaning programme where the tools are chosen on evidence, not labels.

Microfiber really is one of the best tools in cleaning. It just isn't one product, and the word on the package doesn't tell you whether you've got a good one. You find that out from how it's made, how it's used through a shift, and how it's washed afterward.

Cleaning Tools Chosen on Evidence

Binx services schools, clinics, and commercial properties across North Bay and Sudbury with documented textile handling, laundering and disinfection protocols. Get a free quote — 4 business hours response.

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