How to Clean Cast Stone Garden Ornaments and Statues

Short answer: Clean stone garden ornaments and statues with clean water and a soft bristle or nylon brush, never a wire one. Brush off loose dirt dry first, then wet and brush gently, rinse and let the piece dry naturally. Skip pressure washers, bleach, vinegar and other acids. Moss and lichen do the stone no harm, so you only need to remove what you dislike.

This works for cast stone, concrete and most natural stone garden statues. For painted pieces, test a hidden spot first. Looking for something new for the garden? See our unusual garden ornaments.

How do you clean a stone garden ornament?

1. Look first. Check for paint, gilding, cracks or a powdery surface. If anything is flaking or loose, keep to a dry brush.
2. Dry brush. Lift leaves, soil and loose dirt with a soft dry brush so you are not rubbing grit into the surface.
3. Wet and brush. Use clean water and a bristle or nylon brush. Historic England's guidance for stone, brick and concrete says brushes should be bristle or nylon, not wire, and must not scratch the surface.
4. Rinse lightly. A watering can or a sponge is enough. Collect run-off with a sponge on a patio.
5. Let it dry. Choose a mild day so the piece dries naturally, not one just before a frost.

If water alone does not shift ordinary grime, a little mild washing-up liquid in water is a common next step for sound stone; test it on a hidden spot and rinse it off well. Stop as soon as the surface, rather than the dirt, starts to change.

Stone ornament stain chart

What should you not use on stone statues?

• Pressure washers. Historic England notes how easily even domestic pressure washers cause damage, and keeps them to experienced operators on historic stonework. On a garden ornament, the fine detail is exactly what a jet removes.
• Wire brushes and metal tools. They scratch and pull off detail on faces, paws, feathers and lettering.
• Bleach, patio cleaners and acids. Vinegar and brick acid are acids; Historic England warns that acids can harm the surface. The RHS says there is no need for moss killers or chemical patio cleaners on garden hard surfaces.
• Biocides as a first step. Historic England calls biocides the last solution to consider, after defining what the problem actually is.

Should you remove moss and lichen?

Only if you want to. The RHS says algae, lichens and moss do not damage the surfaces they grow on and encourages gardeners to let them flourish where there is no hazard, naming stone sculpture. Historic England also starts from a presumption against removing biological growth, because most is harmless. If you like an aged look, leave it. If you want a cleaner piece, lift loose growth gently and accept that some will return in damp, shady spots.

Is cast stone cleaned differently from natural stone?

No. The cast stone maker Marshalls advises treating cast stone with the same precautions as natural stone. It also warns that cleaning can leave a patchy finish, because different parts of a piece weather differently, and that dirt alone is rarely a problem unless it is causing decay. That is a good reason to clean gently and not too often.

How often should you clean garden ornaments?

When they need it, not on a schedule. A light check each season does more than a hard scrub once a year:

• Spring: brush off winter dirt and check the piece still sits level.
• Summer: rinse pieces under trees or bird feeders.
• Autumn: clear wet leaves from bases, bowls and flat tops.
• Winter: keep pieces out of standing water. Raising a piece on pot feet or bricks keeps its base out of the wet, the same way the RHS advises for containers.

Caring for our garden ornaments

Our garden ornaments are cast stone, painted by hand. Each product page gives its own care line; most say to wipe clean with a soft damp cloth and avoid harsh chemicals, and several advise a sheltered spot outside and bringing the piece in during hard frost. Two examples: The Little Critic owl garden ornament and Professor Grumbletoad wizard frog garden ornament, both about 18 cm (7 in) tall. For general care of stone pieces, see the cast stone care guide; for coatings, see do you need to seal garden ornaments.

Questions

Can you pressure wash stone garden ornaments?

It is safer not to. A jet can strip fine detail and push water into small cracks; clean water and a soft brush do the job without the risk.

What is the best cleaner for stone statues?

Clean water and a soft bristle or nylon brush. Add a little mild washing-up liquid only if water alone does not work, test it on a hidden spot, and rinse well.

Is vinegar safe on stone garden ornaments?

No. Vinegar is an acid, and acids can etch cement-based stone and limestone. Start with water and a soft brush.

Does moss damage stone ornaments?

The RHS says moss, algae and lichens do not damage the surfaces they grow on. Remove them only if you prefer the cleaner look.

How do you clean a painted stone ornament?

Wipe it with a soft damp cloth and avoid harsh chemicals and scrubbing, which can lift paint. Test anything stronger on a hidden spot first.

Ready for a new piece with character? Browse our unusual garden ornaments.

Sources

• Historic England: cleaning guidance for stone, brick and concrete
• RHS: Algae, lichens, liverworts and moss on hard surfaces
• Marshalls cast stone data sheet CSTB8: cleaning, protecting and repair
• RHS: Growing plants in containers