Sandstone Patio Cleaning, Marlow
Natural sandstone patio cleaning in Marlow — heavy moss, algae and early black spot removed, protected with Chiltern EverGuard™, plus a full gutter clean.
Patio Cleaning · Buckinghamshire
Patio Cleaningin Marlow
Marlow is our home town, and its damp riverside air and mature garden trees are hard on paving. We clean each patio to suit its stone, treat the black spot that pressure cannot shift and finish with Chiltern EverGuard™.
- Based here in Marlow
- Black spot treated, not blasted
- Joints re-sanded where needed
Our approach
The stone decides the method not the dirt sitting on it
Two patios in the same road can need quite different handling. Sandstone holds black spot in its pores, limestone marks if it is rushed, porcelain needs an even finish and concrete will tolerate more. At a free site visit we identify what is laid, look at the joints and the growth, and explain which approach we recommend and why.
Marlow gardens
River air, old trees and paving that stays damp
Marlow grew up beside the Thames, and the river shapes its gardens more than most people notice. Mist and damp air hang about on still mornings, and paving beneath a tree canopy or against a north-facing wall can stay wet long after the lawn has dried. That lingering moisture is exactly what green algae, moss and black spot need before they can take hold.
The patios vary as much as the houses. Period homes near the town centre may have older natural stone, inter-war and post-war houses tend to have concrete slabs, and gardens laid out more recently are often Indian sandstone or porcelain. We are based in town and have cleaned patios here, so this mix is familiar ground.
Black spot
Black spot is a lichen living inside the stone
Those small, dark, round marks on sandstone are not dirt. Black spot is a lichen, and it anchors itself in the pores of the stone rather than sitting on the face. That is why a powerful wash may lighten the patio overall and still leave the spots behind, and why turning the pressure up mostly roughens the stone around them.
We deal with it in two stages. First the visible marks are worked on with controlled cleaning and a specialist application. Then, with the paving clean, the Chiltern EverGuard™ Treatment soaks in to target the live growth held within the stone. Where the spotting is very dense, expect a return visit; we will tell you that at the outset.
Paving types
Sandstone, limestone, porcelain and concrete
Each material is handled on its own terms, and an older patio may combine two or three of them where it has been extended at different times.
- Indian sandstone: riven and porous, cleaned gently to keep its texture and treated where black spot has settled in
- Limestone: soft and pale, so worked slowly and at low pressure
- Porcelain: dense and quick to respond; the care goes into an even finish and tidy joints
- Concrete slabs: robust, though edges and weak joints still get a lighter touch
Underfoot
Slippery paving and the joints between slabs
A green film on shaded paving is algae, and on a damp morning it makes the surface treacherous to walk on. Removing it and treating what remains is what makes the patio safer underfoot.
Cleaning also reveals the true state of the joints. Sand that has already gone from the joints is replaced, which beds the slabs firmly again and leaves weeds fewer places to root. Cracked, crumbling mortar joints are different: they need repointing, and we will say so plainly.
After the clean
What the Chiltern EverGuard™ Treatment adds
Once the patio is clean we apply the Chiltern EverGuard™ Treatment. It soaks into porous stone, targets spores and remaining growth, and helps slow how quickly algae, moss and black spot return.
Protection typically lasts between 12 and 24 months. Shade, how wet the garden stays, the type of paving and how often it is swept all play a part: a patio under trees close to the river is likely to need attention again sooner than an open, sunny one.
How it runs
From first look to a finished patio
Each job moves through five stages in a fixed sequence. What varies from garden to garden is how each stage is carried out.
- 01
Free site visit
We identify the stone, check the joints and edges, look closely at the growth and talk through what can realistically be improved, then send a clear quotation setting out the work.
- 02
Surroundings protected
Furniture and pots are moved, and the lawn, borders, doors and walls beside the patio are considered before any water or treatment reaches the stone.
- 03
Cleaned at the lowest effective pressure
The patio is cleaned at the pressure that suits its material and condition, lifting dirt, algae and weathering without scarring the face or blowing out sound joints.
- 04
Black spot treated, joints re-sanded
Black spot receives a specialist application rather than more force. Where the jointing has washed out or broken down, it is re-sanded so the patio is stable underfoot.
- 05
Chiltern EverGuard™ and handover
The Chiltern EverGuard™ Treatment goes on once the surface is clean. Afterwards we go round the patio together, and you hear what was applied and how to look after it.
Worth knowing
The honest limits of patio cleaning
Most paving looks markedly better after a careful clean, and where the stone's condition allows we bring back its original appearance. A few things lie outside what cleaning can reach, and you hear about them before work is booked.
- Rust, oil and long-standing stains set into the stone may fade without vanishing
- Cracked slabs and hollow-sounding spots call for a landscaper
- Paving in deep shade will turn green again sooner than open paving
Why us
Why Marlow homeowners ask us to look
On our doorstep
We are based in Marlow and have cleaned patios here, so damp riverside air and heavy tree cover are conditions we deal with all the time.
Treatment before force
Black spot and lichen are treated with a specialist application, because pressure alone strips the stone without reaching the growth inside it.
Finished properly
Joints are re-sanded where they need it and the area is left tidy, rather than cleaned and left with open, sandless joints.
Fully insured
Fully insured operatives, a method agreed before work starts and a walk-round at the end so you know exactly what was applied.
Nearby
Patio cleaning close to Marlow
Our patio work reaches the villages just outside town as well: Marlow Bottom, Little Marlow, Bourne End, Bisham, Medmenham and Hurley. Their gardens are just as damp and sheltered, and they get the same care.
Patio Cleaning in nearby towns
What Clients Say
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Thank you to every client who has trusted us with their home. Your reviews mean a great deal to us. We’re proud to be fully insured, certified professionals — delivering proven results with a customer-focused approach on every single project.
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Questions
Patio Cleaning in Marlow: your questions
Will the black spot on my sandstone come out?
Usually most of it, yes. The lichen is rooted in the stone, so it takes a specialist application as well as a controlled clean. Spots that have been there a long time may leave a faint grey shadow, and very dense spotting can mean a return visit.
Why does paving near the river turn green so quickly?
Shaded paving near the Thames dries slowly, and algae establish wherever a surface stays damp. Leaves from mature trees add organic matter to the joints, which helps moss along. North-facing patios and those beneath trees usually show it first.
Do you use a pressure washer on every patio?
No. Pressure is one tool among several, and we use as little as the stone needs. Soft or porous paving often does better with a gentler clean and a treatment than with a stronger jet.
Can you clean a porcelain patio?
Yes. Porcelain barely absorbs water, so dirt and algae sit on top and lift without much force. The real skill is consistency: on a smooth, uniform slab, any patch cleaned differently stands out, and so do grubby joints.
How long does Chiltern EverGuard™ protection last on a patio?
Typically between 12 and 24 months. The darker and damper the spot, the sooner growth reappears. The treatment slows regrowth rather than ending it, so a regular sweep and clear drainage still make a difference.
Should my patio be sealed after cleaning?
Sometimes, though not as a matter of course. A sealer can darken stone or give it a sheen, and on some paving it does more harm than good. Once we know what is laid, we will give you a straight view on whether it is worthwhile.
Have you cleaned patios in Marlow before?
Yes. We are based in Marlow and have carried out patio cleaning in the town, so the damp, tree-lined conditions here are ones we already understand well.
More from us
Other services in Marlow
Roof Cleaning
Carefully remove moss, algae and lichens to protect your roof and enhance kerb appeal.
Learn Moreabout Roof Cleaning
Driveway Cleaning
Professional cleaning for block paving, tarmac and resin driveways, restoring colour and removing stains.
Learn Moreabout Driveway Cleaning
Soft Wash Treatment
Low pressure soft wash treatment designed to safely remove algae, mould and grime from exterior surfaces.
Learn Moreabout Soft Wash Treatment
Gutter Cleaning
Clear and flush blocked gutters and downpipes to protect your walls, fascias and foundations.
Learn Moreabout Gutter Cleaning
Solar Panel Cleaning
Pure-water cleaning that removes grime and shading to restore your panels' output and efficiency.
Learn Moreabout Solar Panel Cleaning
Winter serviceSlippery Paths, Steps and Patios
Winter cleaning that removes slippery algae and moss from paths, steps and patios, planned around the forecast.
- Slippery growth removed
- Planned around frost
- Chiltern EverGuard™ where suitable
Advice
Expert exterior cleaning advice
Looking after a commercial building, a managed site or a portfolio? Commercial pressure washing is handled by our commercial team, surveyed and priced as a specified job.
Chiltern Surface Co
Let us look at your patio on a free site visit.
Show us the patio and we will tell you what it is made of, what is growing on it and how we would clean it. A clear quotation follows, and the choice is entirely yours.
Surface-specific recommendations
We assess your surfaces and recommend the right approach for the best, long-lasting results.
Clear, fixed quotation
You'll receive a detailed, transparent quote with no hidden extras.
No pressure or obligation
We'll provide honest advice so you can decide what's right for you.
Directly with the owner
Speak directly with the owner and get expert advice you can trust.