While your instinct might be to grab a scrub brush and a bucket of soapy water, you need to pause. Different materials require different methods. Using the wrong chemical or tool can cause irreparable damage to porous stone or soft bronze. This guide covers how to clean headstones safely and effectively, preserving them for future generations.
Key Takeaways
- Inspect first: Never clean a headstone that is wobbling, flaking, or cracking, as you could cause permanent damage.
- Use the right tools: Stick to natural soft-bristle brushes and plastic scrapers; never use wire brushes or metal tools.
- Choose safe cleaners: Use non-ionic biological cleaners or plain water; avoid bleach, vinegar, and household detergents.
- Work bottom to top: Apply water and cleaners from the bottom upward to prevent permanent streaking.
What You’ll Need
Before heading to the cemetery, gather the right supplies. Using gentle tools is non-negotiable to protect the stone’s finish.
- Jug of distilled water (if access to water is limited)
- Spray bottle or pump sprayer
- Clean buckets
- Natural sea sponges
- Soft-bristled scrub brushes (nylon or natural fiber)
- Old toothbrush (for lettering)
- Plastic scraper or wooden spatula
- Non-ionic biological cleaner (like D/2 Biological Solution)
- Clean, dry cloths
- Protective gloves
How To Clean Marble Gravestones
Marble is a metamorphic rock that is relatively soft and porous. It absorbs chemicals easily and can dissolve if treated with acidic products. Because it is softer than granite, it requires an extremely gentle touch.
1. Assess the Condition
Start by inspecting the stone. Look for cracks, flaking (sugaring), or instability. Push gently on the stone to ensure it does not rock. If the stone is damaged or unstable, do not clean it. You could snap the stone or cause the face to crumble. Call a professional restoration expert instead.
2. Tidy the Surroundings
Clear away overgrown grass, fallen leaves, old floral arrangements, and twigs. If ivy is growing on the stone, do not pull it off, as the roots can rip out pieces of the stone. Cut the vines at the base and let them die off naturally before removal.
3. Saturate the Stone
Marble is like a hard sponge. Before applying any cleaner, thoroughly soak the headstone with clean water. This prevents the cleaning solution from soaking too deep into the stone’s pores, which keeps the chemicals on the surface where they can work on the dirt.
4. Apply Cleaner and Agitate
We recommend using a specific biological cleaner designed for monuments (often called “non-ionic” cleaners). Apply the solution from the bottom up. If you start at the top, the cleaner can run down the dry stone and leave streaks that are nearly impossible to remove.
Let the solution sit for the time recommended on the bottle (usually 10 to 15 minutes) to break down biological growth.
5. Scrub Gently
Dip your soft-bristled brush into water and scrub the stone in a circular motion. Keep the brush wet. For stubborn lichen or moss, use a plastic scraper or a wooden popsicle stick to gently pry it off. Never use metal. Use a toothbrush to clean inside the engraved lettering.
6. Rinse Thoroughly
Rinse the stone completely with clean water. Ensure no chemical residue remains, as this can attract new dirt or continue to react with the stone.
How To Clean Granite, Slate, and Sandstone
Granite is much harder than marble, making it more durable, but it still requires care to avoid scratching the polish. Slate and sandstone are sedimentary and can be prone to delamination (flaking layers), so approach them with caution.
1. Inspect for Delamination
Check for stability. With slate and sandstone specifically, look for layers of stone that appear to be separating. If you hear a hollow sound when you tap it gently, the interior might be compromised. Do not scrub these stones.
2. Pre-Rinse the Marker
Just like with marble, wet the stone thoroughly before applying any cleaners. This is especially important for cleaning granite to prevent chemical staining.
3. Mix and Apply Solution
Use a non-ionic cleaner. Avoid household detergents (like dish soap) because they often contain sulfates or artificial scents that can introduce salts into the stone. Apply your cleaner from the bottom to the top.
4. Scrub and Scrape
Use your soft brush to agitate the dirt. Granite can handle slightly more pressure than marble, but you should still be gentle. If you encounter hard growth, use a plastic scraper. Do not try to chip it off, or you might chip the stone.
5. The Final Rinse
Rinse the headstone from bottom to top, then top to bottom, ensuring a continuous flow of water washes away all debris and soap.
How To Clean Bronze Gravestones
Bronze is a metal alloy, not a stone. It naturally oxidizes over time, turning a dark brown or green (patina). This patina acts as a protective layer. Your goal is to remove surface grime without stripping this protective coating.
1. Clear Debris and Inspect
Remove grass clippings and dirt from around the bronze plaque. Check for dents or deep scratches.
2. Scrub with Water
Bronze markers are often flat to the ground and collect plenty of mud. Wet the marker and use a soft cloth or brush to remove loose dirt. A toothbrush is excellent for getting mud out of the raised lettering and dates.
3. Apply Non-Ionic Cleaner
Mix a small amount of non-ionic detergent with water. Dip your brush and gently scrub the surface. Avoid aggressive scrubbing that reveals shiny metal; you want to keep the dark patina.
4. Rinse and Dry
Rinse the plaque thoroughly. Unlike stone, you want to dry bronze quickly with a clean, lint-free cloth to prevent water spots.
5. Optional: Apply Wax
To protect the bronze and restore a subtle shine, apply a thin coat of clear paste wax (like microcrystalline wax). Rub it on, let it dry until hazy, and then buff it gently with a soft cloth. This creates a barrier against moisture.
Crucial Tips for Success
Cleaning a monument is a labor of love, but good intentions can lead to bad results if you aren’t careful. Keep these professional guidelines in mind.
Check the Weather
Aim for a mild day (between 50°F and 80°F). If the stone is hot to the touch, cool water can cause “thermal shock,” leading to cracks. Conversely, if it is freezing, water can enter microscopic cracks, expand, and shatter the stone.
Get Permission
Technically, the headstone belongs to the family or the cemetery. If it is not your immediate family member, ask permission from the cemetery caretaker or the family before doing any maintenance.
Patience is Key
Some stains, specifically black or green biological growth, might not disappear immediately. Biological cleaners often work over several days or weeks after you rinse them. Don’t over-scrub trying to get instant perfection.
Limit Frequency
Deep cleaning removes a microscopic layer of the surface. Limit deep cleanings to once every 2 to 5 years. For regular maintenance, a simple rinse with plain water is sufficient.
What Not to Use (Avoid These!)
The wrong products cause irreversible chemical damage. The stone might look clean today but will crumble or discolor months later.
No Bleach
Bleach contains salts that crystallize inside the stone’s pores. As these crystals grow, they break the stone apart from the inside out (spalling). It practically dissolves marble over time.
No Wire Brushes
Never use metal brushes, steel wool, or scouring pads. They will scratch the polish on granite and gouge soft marble. Plus, small bits of metal can break off, get stuck in the stone, and rust, leaving orange stains.
No Power Washers
Pressure washers are too aggressive. They force water deep into the stone and can blow off lettering, flake off slate layers, and destroy the grout in stone bases.
No Household Soaps
Avoid dish soap, vinegar, and general household cleaners. They are either too acidic or too alkaline (high pH). Stone requires a neutral pH balance to survive the elements.
No Shaving Cream
There is a myth that putting shaving cream on a headstone helps you read worn lettering. Do not do this. Shaving cream contains acids and moisturizers that penetrate the stone and weaken it over time. Use a mirror to reflect sunlight across the face of the stone to read it instead.
FAQs
How Do You Clean a Headstone Without Damaging It?
The safest method is to use plenty of clean water and a soft-bristled brush. If you need a chemical cleaner, use a non-ionic biological solution specifically made for masonry, such as D/2 Biological Solution. Avoid all household chemicals, bleach, and pressure washers.
Can You Use Vinegar to Clean Headstones?
No. Vinegar is highly acidic. While it might remove surface dirt, the acid eats away at the calcium carbonate in marble and limestone, essentially dissolving the surface of the marker. It can also damage the polish on granite.
How Do I Clean a Very Old Gravestone?
Proceed with extreme caution. Test the stone for stability and flaking first. If the stone is sound, use only plain water and a natural sponge. Do not use brushes on soft or crumbling stone. If the stone is unstable, do not touch it at all; contact a professional conservator.
How Do You Keep a Gravestone Shiny?
You cannot restore the “wet look” shine to a weathered stone without professional re-polishing. Do not apply household waxes, oils, or sealers to stone, as these trap moisture inside and cause the stone to rot from within. Regular rinsing with clean water is the best maintenance.
Is It Disrespectful to Clean a Gravestone?
Generally, cleaning a grave is considered a sign of respect and care. However, it is disrespectful to proceed without family permission or to use aggressive methods that could damage the memorial. Always check with the cemetery office first.
What Causes a Headstone to Turn Black?
Headstones turn black due to biological growth. This includes black algae, fungi, and cyanobacteria that thrive in the pores of the stone. Urban pollution and dirt accumulation can also contribute to the darkening.
Does Baking Soda Clean Headstones?
Using baking soda is not recommended. While it is less damaging than vinegar, baking soda is abrasive and leaves behind salts that can be harmful to the masonry over time. Stick to non-ionic cleaners or plain water.
Summary
Preserving a headstone is about using the “do no harm” approach. Always inspect the marker for instability before touching it. When you are ready to clean, use plenty of water, soft brushes, and patience. Avoid the “fast fix” of bleach or power tools, as these will destroy the history you are trying to protect. By taking your time and using the right materials, you ensure that the memorial remains a beautiful tribute for years to come.
