Soapstone Gravestones: How I Clean the Softest Marker in the Cemetery

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I’ll never forget the first soapstone gravestone I ever cleaned, it was a little marker for a woman named Clara, dated 1887, tucked under an old oak near the back fence. I was new to volunteering, maybe two years in, and I thought I knew everything. Grabbed my usual soft brush and a bucket of water with a splash of dish soap. Big mistake. The stone felt greasy under my fingers, like a bar of wet soap. And the more I scrubbed, the more it seemed to smudge. Took me three tries — and a very patient call to a conservator friend — to understand that soapstone isn’t like granite or marble. It’s soft, it’s oily, and it hates being scrubbed. I felt terrible. Clara’s stone ended up fine, thank goodness, but I learned my lesson the hard way. Now, fifteen years later, I’ve got a system. And I’m going to share it with you, because soapstone deserves the gentlest touch.

What Makes Soapstone Different from Other Gravestones?

Soapstone is a metamorphic rock, mostly talc. That’s what makes it feel slippery, almost like a bar of soap. It’s one of the softest stones used for grave markers — a 1 to 2 on the Mohs hardness scale. For comparison, your fingernail is about a 2.5. So if you press too hard, you can actually scratch the surface. I’ve seen old soapstone markers with deep grooves from well-meaning relatives using stiff bristle brushes. Worse, because soapstone has a natural oily feel, it attracts dirt and lichen differently than other stones. That grime sits on top, not soaked in. Which is good news — it means you don’t need harsh chemicals to lift it. The bad news? If you use the wrong cleaner, you can strip the stone’s natural patina or leave a residue that attracts even more dirt. I always tell people: treat soapstone like a bar of fine soap, not a piece of rock.

My Soapstone Cleaning Kit: What I Actually Use

Here’s what I carry in my bucket for soapstone. I’ve refined this list over years of trial and error. First: a soft natural-bristle brush — the kind you’d use for oil painting, not scrubbing a driveway. I use a 2-inch wide, horsehair brush. Costs about eight dollars. Second: a spray bottle filled with distilled water and a few drops of a pH-neutral, non-ionic cleaner. My go-to is D/2 Biological Solution. It’s pricey, about forty bucks a gallon, but a gallon lasts me a full season. No ammonia, no bleach, no acids. Third: a plastic scraper, like the kind for nonstick pans, for lifting lichen that’s really stuck. Fourth: a soft microfiber cloth, white, no dyes. And fifth: a bucket of distilled water for rinsing. That’s it. No wire brushes, no pressure washer, no vinegar. Never, ever. The talc in soapstone is porous enough that any strong acid or alkaline cleaner will soak in and cause spalling later. I’ve seen it happen. It’s heartbreaking.

Step-by-Step: How I Clean a Soapstone Marker

Start with a dry inspection. I run my fingers over the stone — gently, like I’m reading braille. I’m feeling for loose flakes, deep cracks, or any areas where the stone feels powdery. If it’s flaking, I stop. That stone needs a conservator, not me. If it’s solid, I move on. First, I wet the stone with distilled water from my spray bottle. I don’t pour — I spray until it’s damp, not dripping. Soapstone absorbs water slowly, and too much can freeze and crack it later. Then I take my soft brush and dip it in the same distilled water — no soap yet. I gently sweep away loose dirt, working from the top down. This takes patience. I spend a good ten minutes just doing this. Then I mix my cleaner: about a teaspoon of D/2 per cup of distilled water in my spray bottle. I mist the stone lightly, let it sit for three minutes — I time it on my watch — and then use my brush in small circular motions. I don’t scrub hard. I let the cleaner do the work. For lichen, I use the plastic scraper at a very low angle, almost flat, to lift it off. Never pry. Rinse with distilled water from a second spray bottle, and blot dry with the microfiber cloth. Then I step back and let it air dry for an hour. That’s the whole process. It’s slow. But it works.

What NOT to Do: Lessons from My Mistakes

I already mentioned the dish soap disaster. But I’ve made other mistakes too. Once, I used a nylon brush on a soapstone marker from the 1840s. It left fine scratches that you could only see in sunlight. I felt sick. Now I only use natural bristles. Another time, I tried to speed things up with a pressure washer on a different stone — not soapstone, thank goodness — but the force would of destroyed a soft marker. Soapstone is especially vulnerable because water jets can carve into the talc. Also, never use any cleaner that says ‘degreaser’ or ‘all-purpose.’ Those often have alkaline salts that react with the stone. And please, skip the bleach. I know some old-timers swear by it, but bleach breaks down the talc’s natural structure. I’ve seen a bleach-cleaned soapstone marker go from smooth to crumbly in five years. Just use the pH-neutral stuff. It’s boring, but boring is safe.

Frequently Asked Questions

Q: Can I use a regular garden hose to rinse a soapstone gravestone?

A: I wouldn’t. Tap water often has chlorine and minerals that can leave a film on the stone. Plus, the pressure from a hose can push dirt into the pores. I use distilled water in a spray bottle. Yes, it takes longer, but it’s worth it. If you must use a hose, let it run on a very gentle trickle and keep the nozzle at least a foot away from the stone.

Q: How often should I clean a soapstone marker?

A: Less is more. Once a year is plenty, and only in spring or fall — not in direct sun or freezing wheather. Soapstone can get brittle in extreme temperatures. I clean mine in April or October, when it’s overcast and around 60 degrees. If the stone looks okay, I skip a year. Overcleaning wears it down.

Q: My soapstone marker has black spots that won’t come off with water. What are they?

A: Those are likely manganese or iron staining from the stone’s natural minerals, or old lichen roots that have bonded to the surface. Don’t try to scrub them off — you’ll scratch the stone. Instead, apply a poultice of distilled water and a pH-neutral cleaner (like D/2) mixed with a little white clay powder or paper pulp. Let it sit for 24 hours covered in plastic wrap. That usually draws out the stain. I’ve had good luck with this method on a 1901 marker in the old section.

Q: Is it safe to use a wire brush on soapstone if I’m very gentle?

A: No. Never. Wire brushes are made of metal that’s harder than soapstone. Even if you’re gentle, you’ll leave microscopic scratches that trap dirt and moisture. Over time, those scratches deepen. I’ve seen a wire brush turn a beautifull smooth soapstone slab into a rough mess in just a few cleanings. Stick to soft natural bristles or a plastic scraper.

Q: Can I seal a soapstone gravestone to protect it?

A: I strongly advise against it. Soapstone is naturally dense and oily — it doesn’t need sealing. Sealers trap moisture inside the stone, which can cause it to crack during freeze-thaw cycles. Plus, sealers change the stone’s color and sheen. I’ve never seen a sealed soapstone marker that looked right. Let it be natural.