Is Baking Soda Safe on a Headstone? What It Really Does

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Last spring, I got a call from a woman named Diane. Her grandmother's granite headstone in a little cemetary outside Pune had turned a sad greenish-brown from years of lichen. She'd watched a YouTube video that said 'baking soda and vinegar will make it look brand new.' So she mixed up a paste, scrubbed it on, and left it for ten minutes. Then she rinsed. And the stone came up blotchy — lighter in some spots, darker in others — like a bad bleach stain on a shirt. She called me in tears. 'Patricia, I just wanted to clean it. Did I ruin it forever?'

Here's the thing: baking soda is not the enemy. But it's also not a miracle cure. And using it wrong? That can cause problems you can't see until it's too late. I've been restoring headstones for over twelve years now, and I've seen baking soda do beautifull things — and some real damage. So let's talk about what it actually does, when it's safe, and when you should put that box back in the cupboard.

By the way, I'm not a chemist. I'm just a woman who spends way too much time on her knees in cemeteries, scrubbing stones and talking to dead people's families. So I'll tell you what I've learned the hard way.

The Bottom Line — Is Baking Soda Safe on a Headstone?

Yes — but only on certain stones and only used correctly. Granite, basalt, and other dense, hard stones can handle it. Marble, limestone, sandstone, and slate? Skip it. Use D/2 or just water and a soft brush.

And here's the most important thing I've learned in all my years doing this: the best cleaner for a headstone is often nothing more than water and time. Let the rain wash it. Let the moss grow and then gently brush it off when it's wet. Headstones aren't meant to look brand new. They're meant to look loved. And sometimes that means a little patina, a little moss, a little history.

Diane's grandmother's stone? I fixed it with a poultice of D/2 and alot of patience. Took three weeks of repeated treatments. But it came out beautiful — not perfect, but beautiful. Diane cried when she saw it. 'It looks like her,' she said. 'A little worn, but still here.' That's what I aim for. Not sterile. Just remembered.

Frequently Asked Questions

Q: Can I use baking soda on a marble headstone?

A: I'd advise against it. Marble is soft and porous — baking soda is mildly abrasive. Even a gentle scrub can scratch the polished surface, making it look dull and more prone to staining. For marble, stick to plain water and a soft brush, or a pH-neutral cleaner like D/2 Biological Solution.

Q: What happens if I accidentally use baking soda and vinegar on granite?

A: Granite is tough enough to usually survive it, but the vinegar can dull the polish over time, especially if you let it sit. The baking soda itself is fine on granite, but skip the vinegar. Just use a paste of baking soda and water. If you've already done the vinegar mix and see cloudiness, rinse thoroughly with water and apply a stone-safe polish — but test it on a hidden spot first.

Q: Is baking soda better than D/2 Biological Solution for headstone cleaning?

A: No, not in my experiance. D/2 is specifically formulated to break down biological growth (moss, lichen, algae) without harming any stone type. Baking soda is a mild abrasive that works okay on hard stones like granite for light dirt, but it won't kill the roots of lichen or moss — so they'll come back faster. D/2 costs about $40 a gallon, but it's worth it for the long-term results.

Q: How do I test if my headstone is safe for baking soda?

A: Find a small, inconspicuous area — like the bottom edge or the back — and apply a tiny bit of baking soda paste. Scrub gently with a soft brush for 30 seconds, then rinse and let dry. If the area looks the same as the surrounding stone, you're probably fine. If it looks lighter, more matte, or scratched, don't use baking soda on the rest. Stick to water and a soft brush.

Q: Can I use baking soda on a headstone that has gold leaf lettering?

A: I'd be very careful. Baking soda is abrasive enough to wear away gold leaf, which is extremely thin and fragile. If the lettering is painted or gilded, avoid scrubbing directly over it. Use a soft cloth or sponge with plain water for the lettering, and only use baking soda paste on the flat areas of the stone — and even then, rinse thoroughly so no paste drips onto the lettering.