Do you clean brickwork as well as render?

Yes, we clean brick alongside render using soft washing and steam, particularly for black streaking and ingrained staining, and we adjust pressure to protect older lime mortar.

Is the black streaking on my brick chimney a problem?

Black streaking is typically fungal growth rather than damage to the brick itself, though it can look worse the longer it's left. Soft washing and steam lift it without harming the brick or mortar underneath.

Do I need to be home while you work?

No, as long as we can access the areas being cleaned and there's water available. We'll leave the site tidy and can send before-and-after photos if you're not around.

What render types can you clean?

K-rend, monocouche, pebbledash and traditional sand-and-cement render — each gets treated slightly differently depending on thickness and texture, but all are soft washed rather than pressure washed.

Why has the render on one side of my house gone green and not the others?

Shade and moisture are usually the reason — north or west-facing walls that stay damp longer after rain are more likely to develop algae and lichen than sunnier elevations.

Do you clean commercial and industrial premises?

Yes, we clean render, brick and block on shops, offices and industrial units, usually scheduling around opening hours so it doesn't disrupt business.

Algae, Lichen & Black Streak Removal — Columbia

Render and brick cleaning for homes and businesses in Columbia. Biocide soft washing and steam methods, fully insured, with before-and-after photos.

Soft washing is the correct method: biocide does the cleaning, low pressure just rinses it away, and the render coat itself is never put under the kind of force a pressure washer generates.

We soft wash render and use steam or gentle low-pressure methods on brick, adjusting biocide dwell time and rinse pressure to what the surface can actually take.

If render or brickwork in Columbia has gone green, black-streaked or lichen-covered, we'll soft wash it back to a clean, even finish — no pressure washer near the render coat, ever.

Areas we cover around Columbia

As well as Columbia, we regularly clean render and brick in Washington, Fatfield, Concord and Oxclose, and further out in Low Fell, Silksworth, Houghton-le-Spring and Felling — so if you're nearby but not listed here, get in touch anyway, it's likely still within our patch.

Render and brick cleaning costs, including common extras

Our quotes are always based on what we actually find on site, not a generic price list — established lichen, difficult access or a full portfolio of buildings all shift the number, so treat the ranges below as a starting point.

Standard soft wash, single storey

typically £180–£280

Two-storey property, all sides

typically £350–£550

Additional steam treatment (heavy staining)

add around £60–£120

Gable end / hard-to-reach elevation

add around £40–£90

Render & Brick Cleaning (Soft Wash) near Columbia

The biocide and methods behind a proper render clean

The core of a proper render clean is the biocide treatment — a professional-grade solution applied to kill algae, lichen and the black fungal growth that causes streaking, rather than just washing the surface growth away.

We're biocide trained (2024), so application rates and dwell times are matched to the render type and how bad the growth actually is, not a standard spray-and-rinse. Steam is used where black staining on brick needs extra lift, and low-pressure rinsing finishes both render and brick without disturbing the surface underneath.

Steam cleaning for brick and stubborn staining

Steam is used where black streaking or ingrained staining on brick needs extra lift beyond what biocide alone will shift. It works at high temperature rather than high pressure, which suits older brick and mortar that wouldn't take forceful water well.

How we handle established or difficult growth

1
Identify the growth type
Red algae, green algae, black streaking and lichen all respond slightly differently to biocide treatment.
2
Test area
On heavily established growth we'll often treat a small area first to confirm how the render responds.
3
Extended dwell time
Stubborn lichen crusting gets longer biocide contact time rather than a stronger rinse.
4
Targeted steam
Any remaining black staining on brick after biocide treatment gets a steam pass to finish it off.
5
Rinse and review
A final low-pressure rinse and a walk-round to check nothing's been missed before we leave.

Homeowners

Protecting new-build render finishes

If your home has monocouche or K-rend and it's only a few years old, the last thing you want near it is a pressure washer — it's thin enough that aggressive cleaning can strip or crack the coloured finish. Soft washing keeps the render looking new for longer, without the risk.

Render & Brick Cleaning (Soft Wash) in Columbia — common questions

Soft washing gets to the root of algae, lichen and black streaking rather than just blasting it off, and it's the only method that won't damage K-rend, monocouche, pebbledash or sand-and-cement render. That's the standard we work to on every job across Columbia.

We soft wash render and clean brick across Columbia, using biocide treatment and low pressure to lift algae, lichen and black streaking without risking the render coat or old mortar. Fully insured and biocide trained (2024) — get in touch for a quote.

Algae, lichen and black streaking don't need a pressure washer to shift — they need the right biocide treatment and a bit of patience. That's what we bring to every render and brick job in Columbia.

Render & Brick Cleaning (Soft Wash) in Columbia — the elevation part-way through treatment, in the Washington area

Render & Brick Cleaning (Soft Wash) in Columbia — the finished render drying in the sun, in the Washington area

Algae, Lichen & Black Streak Removal — Columbia

Areas we cover around Columbia

Render and brick cleaning costs, including common extras

Render & Brick Cleaning (Soft Wash) near Columbia

The biocide and methods behind a proper render clean

Steam cleaning for brick and stubborn staining

How we handle established or difficult growth

Identify the growth type

Test area

Extended dwell time

Targeted steam

Rinse and review

Protecting new-build render finishes

Render & Brick Cleaning (Soft Wash) in Columbia — common questions

Before-and-after photos

Biocide trained (2024)

Fully insured

Spill management trained

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