Cleaning a headstone safely means water, a soft brush, and a non-ionic cleaner with a neutral pH of 7 — never bleach, acids, or pressure washing.
A granite marker can look almost new after one careful rinse, or lose its inscription to a single pass with the wrong tool. Cleaning a headstone safely without damaging it comes down to doing less than you think: water, a soft brush, and patience. The damage from bleach, acid, and pressure washing is permanent — and it usually shows up months later, after the surface has already started sugaring and flaking.
The method below follows the National Park Service’s preservation guidance and the VA’s headstone care instructions. It takes an afternoon, costs almost nothing, and keeps the stone intact for the next generation.
Before You Touch The Stone: Three Checks
Stop and get permission first, then confirm the stone is stable, then check the weather — cleaning an unstable or freezing marker causes the exact damage you’re trying to prevent.
Under the “Do No Harm” principle that governs grave-marker care, the gentlest method always wins. Run through these three checks before you bring out any water:
- Permission. Get clearance from the cemetery’s legal authority, the property landowner, and the family. Many cemeteries have their own rules about who may clean markers and when.
- Stability. Do not clean a stone that is leaning, falling, brittle, flaking, or “sugaring” (a sugary, crumbling surface). Contact a professional conservator or a skilled historic crafts person instead — cleaning can cause irreparable damage or injury.
- Temperature. Freezing temperatures can crack a saturated stone.
Step-By-Step Cleaning Method
Clean from the bottom up, work in small areas, and keep the stone wet the whole time so no cleaner ever dries on the surface.
- Pre-wet the stone. Soak it with clean water before applying anything. Pre-wetting keeps cleaner on the surface instead of letting it soak deep into porous stone.
- Start with water alone. A soft brush and plain water handle general dirt, bird droppings, and sap. Many markers need nothing more.
- Add a non-ionic cleaner if needed. Use a cleaner with a neutral pH of 7. Apply it to a small area, starting at the bottom and moving upward — never top-down, which streaks dirty water over clean stone.
- Scrub gently. A soft brush only. Keep the stone wet throughout.
- Rinse thoroughly. Remove every trace of cleaner residue. Leftover cleaner keeps working on the stone long after you’ve walked away.
Biocidal cleaners can help with lichen and other biological growth, but they still have to be compatible with the stone and used exactly per the manufacturer’s directions. If you’d rather compare ready-made options before mixing your own, this roundup of tested headstone cleaner products walks through what’s safe for different stone types.
The goal is honest: cleaning removes soiling, lichen, droppings, dirt, salts, and sap. It does not restore a stone to “like new,” and chasing that look is what leads people into abrasive tools.
What Never To Use On A Headstone
Bleach, muriatic acid, caustic cleaners, wire brushes, and pressure washers all remove original stone material — the damage is irreversible. The table below pairs each banned method with the gentler substitute.
| Never Use | Why It Damages Stone | Safe Substitute |
|---|---|---|
| Bleach and salt-laden cleaners | Bleach-like compounds break down stone and leave salts behind | Non-ionic cleaner, neutral pH 7 |
| Muriatic acid and caustic cleaners | Strong acids and bases etch and eat the surface | Water with a soft brush |
| Pressure washing | Forces water into the stone and blasts away surface material | Garden hose on low flow |
| Sandblasting, grinders, drills | Removes original material and can crack the marker | Hand scrubbing, soft brush only |
| Wire brushes and scouring pads | Abrasives scratch and wear the face of the stone | Soft-bristle brush |
| Household all-purpose cleaners | Unknown chemistry, often acidic or abrasive | Cleaner made for stone |
| Letting cleaner dry on the stone | Concentrates chemicals and stains the surface | Keep the stone wet, rinse fully |
The VA’s headstone care guidance and the NPS preservation standards both single out these methods for the same reason: they trade a short-term shine for permanent loss. The NPS best-practice recommendations for cleaning headstones spell out the full reasoning.
Common Mistakes And How To Avoid Them
Most headstone damage comes from doing too much, too fast — over-treating a stone that only needed a rinse. The fix is almost always to stop sooner.
When stone is flaking, sugaring, delaminating, or otherwise brittle, don’t clean it at all without a professional assessment. On a stable marker, the mistakes that matter are applying cleaner to dry stone, scrubbing after the surface has dried, and reaching for a power tool because the brush felt slow. None of those shortcuts are worth the risk.
Clean in mild weather, keep your expectations honest, and re-check the stone a month later. If it still looks the same, you did it right.
Common Questions
Can I use dish soap to clean a headstone?
It’s better to skip it. Household soaps and all-purpose cleaners have unknown chemistry and are often acidic or abrasive, which can slowly attack the stone surface. Use plain water first, and only add a non-ionic cleaner with a neutral pH of 7 if water alone doesn’t do the job.
How often should a headstone be cleaned?
Only when it actually needs it. Cleaning is meant to remove soiling, lichen, bird droppings, dirt, salts, and sap — not to maintain a polished look. Repeated cleaning wears stone over time, so wait until buildup is visible and bothers you before doing anything.
Is it okay to clean an old or leaning headstone?
No. Leaning, falling, brittle, flaking, or sugaring stones should not be cleaned by hand at all. Cleaning can cause irreparable damage to the stone or injury to you. Contact a professional conservator or a skilled historic crafts person for an assessment before touching it.
Does cleaning a headstone make it look new again?
No, and expecting that leads to damage. Cleaning removes surface soiling and biological growth. It won’t erase weathering, restore faded lettering, or brighten the stone beyond its natural condition. A gentle clean that removes grime is a success — chasing a “like new” finish is how markers get ruined.
Sources
- National Park Service. “Best Practice Recommendations for Cleaning Government-Issued Headstones.” Source for the Do No Harm principle, pre-wetting, and banned cleaning methods.
- U.S. Department of Veterans Affairs. “Cleaning Headstones.” Source for temperature minimums, permission requirements, and step sequence.
- Cemetery Conservators United Standards. “Cleaning Standards.” Source for non-ionic cleaner guidance and marble-specific biocidal cleaner notes.