Cleaned exterior render on a Dorset home after softwash treatment

Dorset · Bournemouth · Poole

Professional Render Cleaning
in Dorset
K-Rend, Silicone & Painted Render; Softwashed Safely.

Modern renders look pristine for the first few years, then coastal air, north-facing walls and mature planting take their toll. We softwash rendered walls with the correct biocide, at the correct pressure, so the render itself isn't damaged, no pressure blasting, no wall streaks, no missed sections.

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Adam runs the business

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The Service

What this job actually involves.

Render cleaning is softwashing at height. A calibrated biocide is applied at low pressure across the render surface, dwelled to kill algae, moss and fungal growth, then rinsed with clean water. The whole point is chemistry doing the killing, pressure doing the mildest possible amount of removing. Get the pressure wrong and you can strip K-Rend colour or bruise a silicone render.

Who it's for

Homeowners with visible green streaking down white or cream render; new-build owners realising the pristine finish is showing algae after 3–5 years; landlords or agents preparing to sell or re-let a rendered property; commercial and multi-unit sites where the exterior render is the first thing customers or tenants see.

When you need it

Green tinge on north-facing walls, black streaking below windowsills or gutters, algae ring around downpipes, obvious two-tone across a facade, discoloration under eaves or around chimneys, all early signs. Sooner is dramatically easier than later.

Why it needs a specialist

Render is thinner and more fragile than most owners realise. A domestic pressure washer used at full whack can strip through-coloured K-Rend surface fines, streak silicone render, or blow a hole clean through a painted acrylic finish. Every year we see homeowners who tried it themselves and now need patch repair as well as a proper clean.

How we quote

For most work we prefer to visit in person so the quote is accurate, no online guesswork. Roof cleans can also be quoted from satellite imagery when a visit isn't convenient. Payment is on completion, cash or bank transfer, no deposits.

Why Waiting Costs More

Left untreated, small problems get expensive.

Render doesn't get dirtier gracefully. It goes from pristine to visibly green quite fast, and then holds moisture in the growth, which is where the real damage starts.

What happens if it's ignored

Algae and moss hold moisture against the render surface, which in freeze-thaw cycles can lift or crack the finish coat.
Streaking below windowsills, gutters and drip details becomes progressively harder to shift as the biological growth beds in.
Painted render fails from the outside inward when algae is left, the paint film breaks down under the growth and needs redecorating rather than cleaning.
A dirty render facade knocks tens of thousands off perceived value on newer properties where 'looks new' is a big part of the sale price.
On commercial buildings, discoloured render sets the tone before customers walk through the front door, and it's noted by every planning and inspection body.

Common DIY mistakes

Using a domestic pressure washer at full pressure. K-Rend and silicone renders can lose surface colour or bruise permanently.
Applying supermarket 'mould and mildew remover', too weak to kill the algae at the root, and often the wrong pH for the render.
Cleaning random patches instead of the full facade. Anything less than wall-by-wall gives a visible line at the boundary.
Painting over dirty render. The paint fails from underneath because the algae is still alive under the film.
Cleaning without gutter/downpipe checks. If a hopper is leaking, the streaks will be back the next winter.

Our Process

A methodical system, not a rushed hose-down.

On-site inspection

We identify the render type; K-Rend, silicone, mineral, acrylic, painted, and check gutters, downpipes and any water ingress points that are causing streaking.

Protection & access

Planting, windows, ground surfaces and delicate detailing protected. IPAF-certified access set up. RAMS provided in advance for commercial work.

Biocide softwash

Professional-grade biocide applied at low pressure, full facade coverage. Dwell time allows the chemistry to kill algae, moss and lichen at the root.

Controlled rinse

Low-pressure rinse with clean water once the biocide has dwelled. Enough to remove residue, gentle enough to preserve the render surface.

Second treatment

Final biocide pass to lock in long-term protection against regrowth. Walk-around inspection with the owner and photographs before payment.

The Payoff

What you actually get for the money.

No damage to the render

Low pressure by design. K-Rend, silicone, mineral, acrylic and painted renders all cleaned without stripping colour or texture.

Long-lasting result

Biocide softwash kills at the root and prevents regrowth. Typical Dorset render stays visibly clean for years after treatment.

Full-facade approach

We clean wall-by-wall, corner-to-corner. No patch cleaning that leaves obvious tide lines.

Working-at-height certified

IPAF and rescue trained. Insurance certificates, RAMS and method statements provided for commercial sign-off.

Delicate detailing preserved

Beading, plinth details, windowsills and drip details are all cleaned around without damage.

Property value protected

Restoring a rendered facade is one of the highest-visibility improvements you can make before sale or valuation.

Deep Detail

Materials, methods and variations we handle.

Every surface behaves differently under pressure, water temperature and chemistry. Here's the technical detail behind the work, the reason we don't quote sight-unseen for most jobs.

Render types we clean

K-Rend and other through-coloured monocouche renders are the most common on newer Dorset builds, the colour goes right through the render coat, so surface damage from over-pressuring is highly visible. Silicone and silicone-silicate renders (Weber, Baumit, Sto) are the current premium finish, water-repellent by design but still prone to biological staining. Mineral renders and traditional sand-cement painted renders behave differently again, the paint layer is what needs the gentler handling. Acrylic renders sit between the two.

K-Rend and other monocouche renders
Silicone and silicone-silicate renders
Acrylic and polymer-modified renders
Mineral render systems
Painted sand-cement traditional render
EWI (external wall insulation) systems

Softwash, the only sensible method

Render manufacturers universally specify low-pressure cleaning with an appropriate biocide. That's not a marketing recommendation, it's what preserves the warranty on newer builds. High-pressure water on K-Rend can literally rinse coloured fines out of the surface, leaving a lighter patch that never matches again. On silicone render the risk is bruising the surface tension of the water-repellent coating. Softwash sidesteps all of this: the chemistry kills, the low-pressure rinse tidies.

Why streaking keeps coming back

If a render facade streaks in the same place every year, the render isn't the problem, the water is. Blocked or leaking gutters, cracked hoppers, poorly-sealed windowsills or missing drip details channel water down the render in the same pattern, and algae follows. Part of every render clean is looking at where the water is running and telling you honestly what needs fixing so the streaks don't return in twelve months. If gutter or fascia repair is needed, we'll flag it, even though it's not our trade.

New-build render

New-build renders on estates around Poole, Wareham and Weymouth typically show their first visible algae in year 3–5. Treated early, one softwash gets them back to as-new. Left until year 8–10, the algae is bedded in and the treatment is more intensive. There's no penalty for treating early, the biocide's still typically effective for years afterward.

Residential vs commercial

Domestic render cleans are typically a one or two day job depending on facade area and access. Commercial rendered facades, offices, care homes, retail units, usually need scheduling around trading hours plus MEWP access. RAMS, method statements, insurance certificates and PO invoicing all handled as standard.

Common Questions

Straight answers, no jargon.

Something not covered here? Send us a message or call Adam directly, most enquiries get a reply within 30 minutes during contact hours (7:30am – 8pm, 7 days).

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How much does render cleaning cost in Dorset?

Priced per property based on facade area, render type, access requirements and any specific staining. Book a free on-site quote and you'll have a firm price in writing.

Will pressure washing damage my K-Rend?

Yes if used aggressively; K-Rend surface fines can be stripped by over-pressuring. That's why we softwash: chemistry kills, low pressure rinses.

How long does render stay clean after treatment?

Under normal Dorset conditions, biocide-treated render typically stays visibly clean for several years. Regrowth timing depends on shade, tree cover and gutter condition.

Can you clean silicone render safely?

Yes, softwash is the manufacturer-approved cleaning method for all major silicone render systems. We follow the specification.

What about painted render?

Painted render responds well to softwash provided the paint film is still sound. If the paint is failing, cleaning can highlight that, and we'll advise honestly at quote stage.

Do you clean render on flats or apartment blocks?

Yes, commercial and multi-occupancy work is a large part of our workload. RAMS, method statements and insurance certificates supplied in advance.

How long does the job take?

One to two days for most domestic properties. Larger properties, commercial buildings and any facade requiring MEWP access are scheduled individually.

Is the biocide safe for planting and pets?

Yes, when applied correctly. We cover planting near the wall and ask that pets are kept inside during application and dwell time.

Do you cover Bournemouth and Poole?

Yes, most of our work is Bournemouth and Poole. We also cover Wareham, Weymouth, Dorchester, Swanage, Southampton and Yeovil.

How soon can you book me in?

Adam replies within 30 minutes during contact hours. Render cleans are usually scheduled 1–3 weeks out depending on weather.

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No deposits. Pay on completion.

Adam replies to most enquiries within 30 minutes during contact hours. £10M public liability, £5M employers' liability, RAMS and Method Statements available for commercial work.

Get My Free Quote 07391 472 789

Bournemouth · Poole · Dorset-wide

Professional Render Cleaning in Dorset K-Rend, Silicone & Painted Render; Softwashed Safely.