Before you touch the stone
Two checks come before any cleaning. First, condition: run your eyes (not your hands) over the stone and look for cracks, flaking, "sugaring" (a granular, eroding surface common on old marble), or lettering with raised edges. If you see any of these, stop — cleaning fragile stone removes original material permanently, and the stone needs a professional conservator, not a brush.
Second, permission. The monument legally belongs to the plot owner, and most cemeteries have rules about who may work on a grave. If you're not the owner of record, get consent first. (Not sure who's responsible for the plot? See our guide to who is responsible for grave maintenance.)
What to use — and what will ruin the stone
| Safe | Never use |
|---|---|
| Plain water — lots of it, before, during, and after | Bleach or any chlorine product — salts break stone apart from within |
| D/2 Biological Solution or an equivalent non-ionic quaternary cleaner | Vinegar, CLR, or any acid — dissolves marble and limestone on contact |
| Soft natural-bristle or nylon brushes | Wire brushes and abrasive pads — scratch every stone type |
| Wooden or plastic scrapers for thick lichen | Pressure washers — erode surfaces and blow out lettering |
D/2 is the standard for a reason: it's the product used by the U.S. National Park Service, Arlington National Cemetery, and most professional monument conservators. It contains no salts, acids, or chlorine, and it keeps killing moss, lichen, mold, and algae for weeks after you rinse it off.
The 7-step method
- Inspect the stone. Sound stone only — no cracks, flaking, or sugaring. When in doubt, don't clean.
- Confirm permission from the plot owner and check cemetery rules (some require registering work in advance).
- Soak the stone thoroughly with clean water. Every surface should be dripping before a brush touches it.
- Apply the cleaner. Spray or brush on D/2 and let it dwell 10–15 minutes, misting with water so it never dries on the surface.
- Scrub gently, bottom to top. Small circular motions with a soft brush. Working bottom-up prevents streaking as dirty runoff flows over pre-wetted stone. Use a wooden scraper — never metal — to lift thick lichen colonies.
- Rinse generously, top to bottom. Flush until the water runs clear and no cleaner remains in the carving.
- Walk away and let it work. Biological cleaners keep breaking down growth for 2–4 weeks. A stone that looks "half clean" on the day often looks dramatically better a month later — resist the urge to re-scrub.
Budget about an hour for an upright headstone, and expect to use several gallons of water. If the cemetery has no water spigot nearby, bring your own — running out of rinse water mid-clean is the most common DIY mistake.
Adjustments by stone type
Granite
The most forgiving stone. Polished granite tolerates slightly firmer brushing, but avoid anything abrasive on the polished face — scratches in polish are permanent and highly visible.
Marble and limestone
Soft, calcite-based, and acid-sensitive. These stones are what the "never use vinegar or bleach" rule exists for. Use the lightest touch; if the surface sheds grit as you brush ("sugaring"), stop entirely.
Sandstone and slate
Often layered, and water can enter the bedding planes. Clean only in warm months so trapped moisture doesn't freeze and split the stone, and never scrape — delaminating layers cannot be reattached.
Bronze markers
Bronze is a different discipline: it needs specialized waxes after cleaning, and household metal polishes strip the protective patina. For bronze, we'd genuinely suggest professional care — see our headstone restoration guide for what that involves.
When to call a professional instead
DIY cleaning is the right choice for a sound, modern granite stone. Call a professional when:
- The stone is marble, limestone, or sandstone older than ~50 years — the risk of permanent loss outweighs the savings.
- The stone is leaning, sunken, or cracked — it needs leveling or structural repair before any cleaning.
- Lettering is faded or illegible — re-cutting letters is skilled stonework, not cleaning.
- You live far from the cemetery — a service that photographs its work lets you verify the result without traveling.
Professional cleaning and restoration typically runs $129–$249 per monument. We've published a full breakdown — including what should be included at each price — in our headstone cleaning cost guide.
Or have it done — with photos to prove it
Tendmory Care restores headstones with conservator-grade methods: biological growth removal, pH-appropriate cleaning, lettering re-cut, and protective sealant. Fixed published prices, booked online, with before-and-after photos in your app the same day.
See grave care pricingFrequently asked questions
Can I use bleach to clean a headstone?
No. Bleach drives soluble salts into the stone; they recrystallize inside the pores and break the stone apart from within. It also permanently yellows marble. Use a non-ionic biological solution such as D/2 instead.
Is it OK to pressure wash a headstone?
No. Pressure washing erodes the surface, blows out mortar joints, and destroys carved lettering — especially on marble, limestone, and sandstone. Professionals use low-pressure water and soft brushes only.
What is the best cleaner for headstones?
D/2 Biological Solution is the standard used by conservators, the National Park Service, and Arlington National Cemetery. Any comparable non-ionic quaternary cleaner with no salts, acids, or chlorine also works.
How often should a headstone be cleaned?
Every 12–18 months in most climates. Over-cleaning wears stone; between cleanings, a good maintenance routine is mostly inspection, trimming, and rinsing.
How much does professional headstone cleaning cost?
Typically $129–$249 per monument depending on type. Tendmory's fixed prices: flat marker $129, upright headstone $169, oversized monument $199, mausoleum $249 — see the full cost guide.