Marble vs. Granite Headstone Cleaning: What's Different
Two of the most common materials in American cemeteries — and two very different cleaning approaches. Here's how to tell them apart, what each stone needs, and why using the wrong method can leave permanent damage on a memorial that's meant to last for generations.
When families ask us how to clean a headstone, the most important question isn't really about technique — it's about material. A method that's perfectly safe for a polished granite marker can permanently etch a marble one in a single afternoon. A product that gently lifts decades of growth from marble can leave streaks across granite. The stone itself decides what's safe.
Granite and marble look superficially similar from a distance, but chemically and structurally they couldn't be more different. Knowing which one you're standing in front of — and what it can and can't tolerate — is the single most important step in protecting a memorial.
Granite Headstones
Granite is the workhorse of modern cemeteries. It's an igneous rock — formed from cooled magma — and it's hard, dense, and largely non-porous. Most markers from the mid-twentieth century onward are granite, and it's by far the most common material you'll see in newer sections of any cemetery. Its durability is exactly why it took over: a polished granite stone can hold a crisp inscription for centuries.
The right method: granite responds well to a soft natural-bristle brush, a pH-neutral biological cleaner like D/2 Biological Solution, and a thorough low-pressure rinse with clean water. Saturate the stone first, apply the cleaner at full strength, let it dwell briefly, scrub gently in light circular motions, and rinse top to bottom. A mild dish-free soap can substitute in a pinch for surface grime, but D/2 is the gold standard because it keeps working against biological growth for weeks after application.
What to avoid: even though granite is durable, it isn't invincible. Pressure washers strip the polished finish — once that mirror surface is gone, it can't be restored in the field. Wire brushes scratch the stone. Bleach leaves salt residues that wick back to the surface and stain for years. Acidic cleaners eat into the feldspar in granite over time. Patient and gentle always beats fast and aggressive.
Marble Headstones
Marble is a metamorphic rock — limestone that's been transformed by heat and pressure — and it's the stone you'll find on most older markers, especially in historic cemeteries. Many nineteenth- and early-twentieth-century stones are marble, recognizable by their soft white, gray, or cream-colored surfaces. It's beautiful, easy to carve, and deeply traditional. It's also significantly softer and more porous than granite, which means it requires far more care.
Critical: never use anything acidic on marble. Marble is calcium carbonate, and acid dissolves it on contact. Vinegar, lemon juice, CLR, bleach, and most household bathroom cleaners will permanently etch the surface — leaving dull, pitted patches that can't be polished out. The damage is often invisible for the first hour and only becomes obvious once the stone dries. By then, it's too late.
The right method: use distilled water (tap water can leave mineral deposits on porous stone) and Orvus paste, a pH-neutral, non-ionic soap originally formulated for washing show animals and antique textiles. D/2 Biological Solution is also safe and effective on marble. Apply with a very soft natural-bristle brush, work gently in small sections, and rinse thoroughly with more distilled water.
Never pressure wash marble. Even at low settings, the force of a pressure washer is enough to erode soft marble surfaces and blur an inscription that's been legible for a century.
Other Stone Types You Might Encounter
Limestone behaves a lot like marble — it's also a calcium-carbonate stone, even softer and more porous. Treat it the same way: distilled water, Orvus or D/2, soft brush, no acids, no pressure. Limestone is especially common in older Southern and Midwestern cemeteries.
Bronze plaques follow a different protocol entirely. Never use abrasives, D/2, or general stone cleaners on bronze — they can strip the protective patina. A dedicated bronze cleaner, applied with a soft cloth, is the right approach. After cleaning, many conservators apply a thin coat of paste wax to protect the surface from oxidation.
How to Identify What Type of Headstone You Have
If you aren't sure what your loved one's marker is made of, three quick clues usually settle it.
- Age: markers from before about 1920 are most often marble or limestone. Markers from the 1950s onward are overwhelmingly granite.
- Color: white, off-white, soft gray, or cream-colored stones are almost always marble or limestone. Dark gray, black, deep red, and mottled pink stones are almost always granite.
- Texture and finish: marble has a slightly chalky, matte surface — even when new, it doesn't take a high polish well. Granite is typically polished to a mirror finish on the inscription face and has a visibly crystalline grain when you look closely.
If your stone is older, light-colored, and has a soft matte surface, treat it as marble. If it's newer, dark, and shiny, treat it as granite. When in doubt, default to the gentlest possible method — distilled water and a soft brush — until you can confirm.
Frequently Asked Questions
Can I use the same cleaner on marble and granite?
D/2 Biological Solution is safe on both, which is a big part of why it's the conservation-industry standard. But you should never use any acidic cleaner — vinegar, bleach, CLR, or general bathroom products — on marble, even though granite can tolerate brief exposure to some of them. Default to D/2 and you can't go wrong.
How can I tell if my marble headstone has already been etched?
Etched areas look dull, slightly chalky, or pitted compared to the surrounding stone, even when the marker is dry. They'll often feel rougher under your fingertip. Once etching has happened, a professional conservator can sometimes blend or minimize the damage, but it can't be fully reversed.
Is granite really maintenance-free?
No stone is. Granite is far more forgiving than marble, but it still collects lichen, algae, and mineral staining over time, especially in shaded or humid sections of a cemetery. A periodic cleaning every one to three years keeps the inscription crisp and prevents biological growth from rooting deeply into the polished surface.