By Bill Luallen

If you spend five minutes on the phone with me, you’ll probably hear me talk about two of my passions: floor care and mountain biking.

At first glance, pounding down a rocky trail on two wheels doesn’t look like it has much to do with maintaining tens of thousands of dollars of flooring in a corporate headquarters or a luxury condo high-rise. But it has everything to do with it.

When I’m training, I practice the same tight, technical lines over and over. I don’t wing it on race day. If I make an error in judgment on a steep climb or bomb a downhill without reading the terrain, I end up eating dirt. In the commercial floor care world, when a crew member “wings it” on a natural stone lobby floor, the results are exactly the same. Except instead of road rash that will heal, you’re looking at possibly thousands of dollars in ruined marble, etched limestone, and an unhappy client.

With the shift we are seeing in some commercial spaces transitioning into high-end adaptive reuse condos and facilities, property managers don’t want five separate niche contractors anymore. They want a one-stop shop that can handle floor maintenance on carpet tiles, gym floor rubber, and luxury stone. But here is the problem: crews are walking onto magnificent natural stone floors armed with the exact same tools and chemicals they use on resilient surfaces.

We need to talk about why that must stop, and how to build a stone program that actually protects that expensive asset.

The Baseline Rule: You Cannot Protect What You Cannot Identify

Before a technician ever drops a mop or an auto-scrubber onto a floor, they must answer one fundamental question: What specific material am I standing on? In the resilient flooring world, vinyl composition tile (VCT), luxury vinyl tile (LVT), and sheet rubber are mostly forgiving of standard neutral or slightly alkaline cleaners. Natural stone is entirely different. “Natural stone” is an umbrella term, not a single material. If your crew treats granite the same way they treat limestone, or mistakes a man-made porcelain for a natural quartzite, you are riding a direct line toward a catastrophic restoration claim.

To build a competent stone program, your team must be trained to categorize stone into two primary geological camps:

• Calcite Stones (Calcium Carbonate-Based): This group includes marble, limestone, travertine, and onyx. These stones are chemically sensitive to acids. Introducing an acidic grout cleaner or even an acidic beverage to these surfaces will cause immediate, permanent chemical etching.
• Siliceous Stones (Silica/Quartz-Based): This group includes granite, serpentine, basalt and slate. These stones are generally much harder and highly resistant to acids. However, they are still susceptible to mechanical scratching, improper topical coatings, and dulling from improper chelating agents.

The Field Identification Test: Never guess. Instruct your crews to look for telltale visual markers—such as the distinct veining of marble, the pitted voids of unfilled travertine, or the granular, crystalline structure of granite. When in doubt, perform a discreet acid scratch test in an inconspicuous area (like a corner or behind a door) using a single drop of a mild acid solution. If it fizzes, it’s calcareous, and acids must not be used. Note: if there is a topical coating, you will need to remove it prior to doing the test.

The Chemistry Mistake: Improper selection can start the crash

I see it all the time. A crew takes an all-purpose cleaner or a harsh acidic grout cleaner and unthinkingly slaps it onto a beautiful, polished marble or limestone floor.

Because these calcareous stones are primarily composed of calcium carbonate, the reaction to acid is violent on a microscopic level. It eats away at the surface. In our industry, we call this etching. It looks like a dull watermark, a scratched, hazy patch, or a pitted surface, but it’s permanent chemical damage.

The Chemistry Rule: If it’s stone, think neutral. A pH-neutral cleaner (right around 7.0) is your absolute baseline for daily maintenance, but there’s a catch.

The Hidden Trap: The Chelating Agent

Simply checking the pH box isn’t enough. Many floor care crews grab a generic, low-cost neutral cleaner or attempt to use highly diluted resilient floor cleaners, assuming neutrality equals safety. This almost always leads to a frustrating lack of good results.

When cleaning natural stone, you are constantly battling hard water minerals (like calcium and magnesium) present in your water supply and the environment. High-quality, engineered stone cleaners contain specific chelating agents (sequestrants) that chemically bind to these hard water minerals, holding them in suspension so they can be easily rinsed away.

What can happen when you use improperly designed chemistry on natural stone?

• The Soap Scum & Mineral Veil: Your solution will react with the stone’s own mineral structure. Instead of lifting dirt, the chemistry leaves behind a microscopic, stubborn soap scum film and mineral haze.
• The High-Sheen Killer: This leave-behind can rapidly dull the stone’s natural clarity and factory polish, turning a mirror-like lobby into a hazy, matte disappointment.
• Attracting More Soil: This leftover chemical residue creates a tacky surface film. Instead of repelling dirt, the floor acts like a magnet for foot-traffic soil, forcing your crew to clean more often with the very chemistry that is causing the problem.

If you are dealing with siliceous stone like granite, it’s tougher, sure. But even granite has natural bonds that can be dulled over time by aggressive, non-specific chemistry or mineral buildup. Don’t let your crews guess. Look at the Safety Data Sheets (SDS), verify the pH, and ensure the chemistry is explicitly engineered for stone care with proper water-conditioning chelators.

The Maintenance Routine: You Can’t Buff Your Way Out of Poor Soil Management

In commercial carpet care, we emphasize the importance of soil containment. Stone flooring is no different. The enemy of a high-sheen stone lobby isn’t just heavy foot traffic; it’s the microscopic particulate tracking in on the bottoms of shoes.

Dry particulate can act exactly like 60-grit sandpaper under the weight of thousands of foot falls. If you leave dry soil on a polished marble floor, people walking across it will slowly grind away that crisp finish.

The Stone Protection Protocol

The Myth of the Miracle Poultice: Diagnosis Over Guesswork

When we run training classes, I often will take a few different types of stone and purposefully soil them with materials like oil or coffee etc.. I want technicians to work on getting those stains out before they try to do it in a client’s lobby.

But here is where a major misconception sits in our industry: not all stains will come out with a poultice.

Poultices are a fantastic tool in stone restoration, but they aren’t magic. A poultice works by drawing certain contaminants out of the stone through “wicking” (capillary action). That means the stain has to be something that can actually move back upward through the pores of the stone.

• Oil stains? Often, yes.
• Organic stains (like coffee)? Sometimes.
• Rust stains? Possible, but often that rust comes from actually inside the stone.
• Dyes, inks? That’s a whole different animal.

Here’s the part many people miss: not every discoloration is a stain. This goes hand-in-hand with your initial material identification. Sometimes what looks like a stain is actually mineral oxidation, moisture trapped below the stone, adhesive bleed, sealer residue, or even a natural mineral vein inherent to the stone itself. You can poultice those until next Tuesday, and all you’ll have to show for it is a wet piece of stone and a very disappointed customer.

The trick to stone care is diagnosis. Before you reach for the poultice powder and chemicals, figure out what actually caused the mark. Test carefully in an inconspicuous area. Look at the specific stone type. Ask the facility manager what was spilled. Consider subsurface moisture, previous cleaning chemicals and materials, application of topical sealers or finishes, or tracked in substances and installation materials.

The Turning Point: Knowing When It’s Time for Mechanical Restoration

You can have the most disciplined daily maintenance program in the world, but eventually, time and heavy foot traffic win. I think of it like the tires on my mountain bike. No matter how clean I keep the chain or how carefully I dial in the suspension, after enough hard miles on rough terrain, the tread wears down.

On a natural stone floor, that worn-out tread manifests as a loss of sheen. The once-mirror-like polish begins to look dull, hazy, and walked-out in high-traffic lanes.

When a resilient floor loses its shine, the instinct of a traditional janitorial crew is to slap a coat of finish on top of it and call it a day. Please do not do this to natural stone. When stone loses its polish, it isn’t because a coating wore off; it’s because microscopic scratches have physically altered how light reflects off the surface.

To bring it back, you need to reset the profile of the stone through mechanical honing and/or polishing.

The Restoration Continuum

Mechanical restoration isn’t a chemical trick—it is a progressive, physical process utilizing diamond-impregnated pads or tooling with abrasives, under weighted floor machines. 

Mechanical Honing: Think of this as the heavy-duty repair stage. Honing uses coarser grit diamonds to physically shave away a microscopic layer of the stone. This process cuts right through light scratches, minor chemical etching, and deep-set traffic patterns, leaving the floor perfectly flat with a smooth, uniform satin finish.

Mechanical Polishing: Once the surface is perfectly uniform from honing, you step up through progressively finer diamond grits (often finishing at 3,000 or more grit or using specialized polishing powders). This process allows light to reflect perfectly off the surface once again, restoring that deep, natural, optical clarity without the use of topical acrylic finishes.

The Professional Standard: Mechanical restoration is where you separate the true stone craftsmen from the “bucket-and-mop” crews. It requires a deep understanding of flooring material, and the polishing process. Done correctly, it doesn’t just mask the wear—it physically resets the clock on the stone, returning the floor to its original brilliance and providing a sustainable surface that is significantly easier to maintain moving forward.

The Bottom Line: Lean on Training and Practice

At the end of the day, successful floor care isn’t a mystery, and it shouldn’t be based on a hunch or some “magic bullet” product. It’s about education, training, and building a repeatable, data-driven process.

Stone care is about understanding the exact material you are working on and knowing what service procedure you should use to achieve the expected outcome, whether that is honing, polishing, sealing, or just basic maintenance.

When you train your team to identify the stone correctly and treat it with the unique structural respect it demands, you do two things: you protect your company from catastrophic damage claims, and you become an indispensable partner to property managers who are desperate for real expertise.

Keep it clean, keep it neutral, and do your practicing before you hit the trail.