What NOT to Use When Cleaning a Headstone (And Why)
headstone cleaning in New York | headstone cleaning in Florida
I remember my first headstone cleaning like it was yesterday, it was a crisp October morning at St. Mary's Cemetary, and I was determined to restore a beautifull old marble marker for a Civil War veteran. I had read somewhere that a little bleach and a stiff brush would do the trick. So I mixed up a bucket of bleach water, grabbed a wire brush, and went to work. Within minutes, the stone started to look whiter—but also rougher, almost powdery. By the time I finished, I had etched permanent scratches into the surface and created a chemical reaction that would accelerate it's decay for decades. The family who later visited was heartbroken, and I felt sick. That day taught me a lesson I've never forgotten: cleaning a headstone isn't about elbow grease or harsh chemicals—it's about doing no harm. Over the years, as a volunteer preservationist, I've seen too many well-meaning people accidentally damage stones with the wrong tools and cleaners. So let's talk about what you should never use, and why it matters.
Skip the Harsh Household Cleaners
I get it—when you see a grimy headstone, your first instinct is to reach for something strong like a general-purpose cleaner or a degreaser. But here's the hard truth: most household cleaners are either acidic or alkaline, and both are enemies of historic stone. Marble and limestone are especially vulnerable because they're calcium-based—they react with acids by dissolving, leaving behind a pitted, etched surface. Alkaline cleaners, like those with lye or ammonia, can cause salts to form inside the stone's pores, leading to spalling (flaking) over time. Even diluted versions can do damage. Stick with a pH-neutral, non-ionic cleaner like D/2 Biological Solution. It's what I've used on hundreds of stones, and it safely lifts biological growth without eating away the stone itself.
Avoid Abrasive Tools and Scrubbers
I once watched a well-intentioned family scrub their grandmother's granite marker with a steel wool pad. They thought they were saving it—instead, they left a network of micro-scratches that trapped dirt and made the stone look permanently dull. The rule of thumb is simple: if you wouldn't use it on your own skin, don't use it on a headstone. That means no wire brushes, no steel wool, no scouring pads, and no hard-bristle brushes. Even a stiff nylon brush can be too much on soft stone like sandstone. I only use soft-bristle brushes (natural or synthetic) and plenty of water. For stubborn lichen, I gently use a wooden scraper or a plastic putty knife. Remember: it's better to leave some moss than to leave permanent gouges.
Steer Clear of Strong Acids and Alkaline Cleaners
This is the most importent rule in preservation. Many commercial masonry cleaners contain harsh chemicals that can dissolve stone or leave harmful residues. I've seen people use products meant for concrete driveways on 200-year-old slate—and the results were devastating. The stone turned chalky and crumbled within months. The same goes for any cleaner that fizzes on contact; that fizzing is a chemical reaction eating away your stone. If you're unsure about a product, test it on a small hidden area first. But honestly, there's no reason to experiment when safe alternatives exist. D/2 has been tested extensively and is trusted by preservationists nationwide. It's gentle enough for the most delicate marble yet effective on tough biological stains.
Never Use High-Pressure Washing
I know it's tempting to just blast the grime away with a pressure washer—I've seen people do it, and it always breaks my heart. High-pressure water can scour away the stone's surface, erode inscriptions, and force moisture deep into cracks, leading to freeze-thaw damage in colder climates. Even on granite, which is harder, the pressure can dislodge loose fragments or blow out weakened areas. The only exception is a very low-pressure garden hose with a gentle spray nozzle, and even then, you need to keep the stream at a distance. I clean everything by hand, using a bucket of water and a soft brush. It takes longer, but the stone will last centuries longer because of it.
Don't Forget to Avoid Wax, Sealants, or Coatings
A visitor once told me they'd applied car wax to their mother's headstone to 'protect it.' They meant well, but wax and sealants are a nightmare for preservation. They trap moisture against the stone, promote biological growth underneath, and yellow or darken over time. Worse, they're nearly impossible to remove without harsh chemicals that damage the stone. The same goes for any coating that promises to 'weatherproof' a headstone. Historic stones need to breathe—moisture that gets in must be able to evaporate. If you seal the surface, that moisture gets trapped and can cause internal cracking (called spalling). The best protection is simply keeping the stone clean and allowing it to dry naturally.
Frequently Asked Questions
Q: Can I use vinegar to clean a headstone?
A: No, please don't. Vinegar is acidic, and even though it's a natural cleaner, it will etch and dissolve calcium-based stones like marble and limestone. I've seen it turn a beautiful white marble surface into a rough, dull mess in just one application. Stick with a pH-neutral cleaner.
Q: What about using baking soda as a gentle scrub?
A: Baking soda is alkaline, and while it's less aggressive than some cleaners, it can still leave a residue that attracts moisture and promotes efflorescence (white salt deposits). Plus, the gritty texture can act like a mild abrasive on softer stones. I recommend avoiding it entirely.
Q: Is it okay to use a magic eraser on a headstone?
A: I wouldn't. Those melamine foam sponges are actually very fine abrasives—they work by sanding the surface. On a headstone, they can dull the finish, remove patina, and even wear down inscriptions over time. Soft cloths and water are your best friends.
Q: Can I use dish soap like Dawn to clean a headstone?
A: Only if it's a very mild, pH-neutral formula, and even then, it's risky. Many dish soaps contain degreasers, fragrances, and dyes that can leave residues or react with the stone. If you must use soap, choose a pure castile soap (like Dr. Bronner's) and rinse extremely thoroughly. But honestly, D/2 is safer and more effective.
Q: What if the headstone is already damaged—should I still clean it?
A: Proceed with extreme caution. If the stone is flaking, crumbling, or has loose pieces, cleaning can make it worse. I always consult a professional conservator before touching a damaged stone. In some cases, it's better to leave it alone than risk accelerating the decay.