It’s a natural impulse. You visit a family grave, notice it’s looking a bit weathered or covered in green algae, and you want to tidy it up. A bucket of soapy water and a bit of elbow grease feels like a small tribute to your loved one.
But here’s the truth: more damage is done to memorials by well-meaning relatives than by a century of Lincolnshire rain.
We’ve seen stones that survived two World Wars ruined in twenty minutes by the wrong cleaning product. So before you reach for that spray bottle, here’s why you should think twice about tackling a headstone yourself.
The Bleach Disaster
This is the most common mistake we see. People assume that because bleach kills mould in a bathroom, it’ll work on a headstone. It won’t.
Household bleach contains salts. When you spray it on porous stone like marble or limestone, those salts soak deep into the material. Then, when the sun comes out and the stone dries, those salts crystallise and expand inside the stone.
This causes something called “spalling”, where the face of the stone literally starts to flake off and crumble. Once that happens, the damage is permanent. There’s no fixing it.
Pressure Washers Look Satisfying, But…
You’ve probably seen those viral videos. A grimy surface transformed in seconds by a jet of water. Tempting, right?
On older stones, though, that high-pressure jet can strip away the protective outer layer of the rock. It can also blast out the lead or enamel lettering from the inscriptions. And if the stone has any hairline fractures you can’t see, the pressure can turn a small crack into a clean break.
Wire Brushes and Scouring Pads
If you use a wire brush on a polished granite memorial, you will scratch the surface. Those scratches then become a perfect home for more algae and dirt to settle in. The stone ends up looking worse, and faster.
On softer stones like Nabresina or York stone, a stiff brush can scrub away the fine details of the carving. You might not notice it at first, but over time, the damage becomes obvious.
The Wrong Soap
Many household detergents contain fats, oils, or dyes. Stone is a natural, porous material. If you coat it in oily soap, you can cause permanent staining or a “shadow” on the stone that no professional can remove.
We’ve seen this happen more times than we’d like to admit. It’s heartbreaking, really, because it’s always done with good intentions.
So, What Can You Do Safely?
If you really want to tidy up a grave yourself, stick to these “safe-only” rules:
Use water only. Clean, cool water is usually enough to remove surface dirt.
Soft brushes only. Think of a soft-bristled toothbrush or a very soft nylon kitchen brush. Never use metal.
Test a small area first. Always try your cleaning on a small, hidden spot at the back of the base. Wait a day or two to see if any staining appears.
Don’t scrub inscriptions. If the letters are loose or the paint is flaking, stop immediately.
That’s it. Honestly, less is more when it comes to cleaning a memorial.
When to Call Us
If the stone is covered in thick, black crust, heavy lichen, or if the lettering is fading, it needs a professional touch.
We use specialist, non-ionic biological cleaners and, in some cases, controlled steam cleaning (DOFF systems) that gently lift the grime without touching the integrity of the stone.
It’s about preservation, not just cleaning. Our goal is to make the stone look respected and cared for, not “brand new” at the cost of its lifespan. Because a memorial should last for generations, not just a few more years.
If you’re worried about a family memorial, or you’re just not sure where to start, give us a call. We’re here to help, and we’re happy to talk through your options with no pressure.
Your Questions About Cleaning Memorials
Can I use washing up liquid on a headstone?
We don’t recommend it. Most washing up liquids contain fats, oils, or dyes that can stain porous stone permanently. If you want to clean a memorial yourself, stick to plain water and a very soft brush.
How often should a headstone be cleaned?
It depends on the location and the type of stone, but generally once every few years is enough. Over-cleaning can cause more harm than good, especially if you’re using anything stronger than water.
What does professional headstone cleaning cost?
It varies depending on the size and condition of the memorial, but we’ll always give you an honest quote before we start. Our focus is on preserving the stone properly, not just making it look clean for a few months.
Can a damaged headstone be repaired?
Often, yes. We’ve restored memorials that were badly weathered, cracked, or even broken. The best thing to do is get in touch so we can assess the stone and talk through what’s possible.
Is it safe to clean a marble headstone?
Marble is soft and porous, so it’s very easy to damage. Never use bleach, acids, or abrasive brushes on marble. If you’re unsure, it’s always safer to call a professional rather than risk permanent harm.
