How to Clean a Headstone Without Damaging It

The Wrong Cleaner Does More Damage Than Decades of Weather

Bleach, pressure washers, wire brushes, vinegar, and household bathroom cleaners are the most common ways people ruin headstones. Granite is hard, but it's not indestructible — acidic or abrasive agents etch the polished surface, strip protective sealants, and accelerate the very weathering they're meant to fix. Marble and limestone are even more vulnerable; a single bleach application can dissolve surface calcium and leave permanent white streaks.

Before touching the stone, identify the material. Granite, marble, bronze, and sandstone each require different approaches.

Safe Cleaning Method for Granite Headstones

Granite is the most forgiving material, but the polished finish still scratches.

What you need: clean water (several gallons), a soft-bristle nylon brush (never wire), a plastic scraper for stubborn lichen, and — if plain water isn't enough — a non-ionic cleaner like D/2 Biological Solution, which is used by the National Park Service and the Department of Veterans Affairs on government headstones.

Steps:

1. Soak the stone thoroughly with clean water first. Dry stone absorbs cleaning solution into its pores.
2. Apply D/2 or a similar non-ionic cleaner with a spray bottle. Let it dwell for 5–10 minutes.
3. Scrub gently with the soft-bristle brush, working in small circles. Start at the bottom and work up — dripping dirty solution onto dry stone causes streaking.
4. Rinse thoroughly with clean water.
5. For biological growth (lichen, moss, algae), apply D/2 and leave it. The solution continues working over weeks. You'll often see the best results on your next visit, not the day you apply it.

Never use: bleach, muriatic acid, vinegar, pressure washers, metal scrapers, or abrasive pads. Pressure washers can exceed 2,000 PSI — enough to blast the polished face off granite and strip letter fill from engravings.

Cleaning Marble and Limestone

These stones are softer and more porous than granite. Acid-based cleaners dissolve the calcium carbonate that makes up the stone itself.

Use only water and D/2 (or another pH-neutral, non-ionic cleaner). Skip the scraper entirely — even a plastic one can gouge weathered marble. Use the softest brush you can find, and apply almost no pressure. If biological growth is embedded, let the chemical solution do the work over multiple applications rather than scrubbing harder.

Historic marble monuments with heavy erosion, flaking, or missing fragments should not be cleaned by amateurs. Contact a conservator certified by the American Institute for Conservation (AIC).

Cleaning Bronze Markers

Bronze develops a greenish patina over time — this is normal oxidation that actually protects the metal underneath. Most bronze markers are designed to patina.

If you want to restore the original finish:

1. Wash with mild dish soap and water.
2. Apply a commercial bronze cleaner or a paste of baking soda and water.
3. Rinse thoroughly and dry completely.
4. Apply a thin coat of paste wax (like Renaissance Wax) to slow future oxidation.

The wax protection lasts about a year in most climates, so plan on an annual application if you want to maintain the polished look.

When to Call a Professional Restorer

DIY cleaning handles surface dirt, biological growth, and minor staining. Call a professional when you see:

• Structural cracking or separation between the headstone and base
• Sinking or tilting — the foundation, not the stone, is the problem
• Deep staining from rust, sap veins, or iron deposits inside the granite
• Flaking or spalling on marble or sandstone (a sign of freeze-thaw damage)
• Missing or deteriorating letter fill that needs re-leading or re-painting

Professional restoration typically costs $200–$600 for cleaning and $500–$2,000+ for structural repair, depending on the monument's size and the severity of the damage.

A Maintenance Schedule That Prevents Big Problems

A quick annual visit catches small issues before they become expensive repairs:

• Annually: Rinse with water, check for tilting or sinking, inspect the base joint.
• Every 2–3 years: Apply D/2 or a non-ionic cleaner; remove any biological growth.
• Every 5–10 years: Check whether the headstone passes a simple hand-stability test — can you rock it? If so, the foundation may need resetting.

The Headstone, Gravestone & Memorial Marker Guide includes a maintenance schedule, an installation day checklist, and a section on headstone warranties — so families know exactly what to inspect and when.