Clean Slate Exteriors North-West

Render cleaningGreen to clean, without damaging the finish

Algae loves render, especially under window sills and on walls that don't see much sun. A softwash treatment lifts the staining and kills the growth, without the damage a jet wash can do.

  • Free estimates
  • Before & after photos
  • Fully tidied away
Large white rendered home with a clean facade and sandstone driveway
Bright again

Signs your render needs cleaning

Render usually tells you when it needs a clean. Here's what to look for.

  • Green streaks under sills

    Water runs off the sill and algae follows it down the wall.

  • Black patches

    Darker staining on shaded walls that doesn't wash off.

  • Green along the base

    Splash-back from the ground turns the bottom of the wall green.

  • Dull, grey finish

    White render that has slowly turned grey.

Drag the line.
See the difference.

Every render cleaning job finishes with before and after photos. Here's one we did earlier.

Rendered house front, before and after cleaning, beforeRendered house front, before and after cleaning, after
BeforeAfter
Step by step

How we clean render

  1. Identify the render

    K-Rend, silicone, painted or pebbledash. Each needs the right approach.

  2. Protect

    Windows, doors and plants protected before we start.

  3. Softwash applied

    The treatment goes on at low pressure and gets to work.

  4. Dwell and rinse

    Given time to work, then gently rinsed.

  5. Photos

    Before and after photos of your walls.

Get a price

What's included

  • Render type checked
  • Windows, doors and plants protected
  • Low-pressure softwash treatment
  • Gentle rinse down
  • Before and after photos
  • Advice on keeping it clean

Render we clean

  • K-Rend
  • Silicone render
  • Monocouche
  • Painted render
  • Pebbledash
  • Masonry paint

Not sure what yours is? Tell us about it in the form and we'll let you know.

Softwash or pressure wash?

Two different tools for two different jobs. We choose the right one for each surface, so nothing gets damaged and everything comes clean.

Softwashing

Cleaning solutions applied at low pressure. Kills moss, algae and lichen at the root, and keeps working after we leave.

  • Render, cladding and painted walls
  • Fascias, soffits and delicate finishes
  • Anywhere a jet wash could cause damage
About softwashing

Pressure washing

High-pressure water for tough, hard-wearing surfaces. Strips back years of dirt, weeds and grime quickly.

  • Block paving and concrete driveways
  • Steps, paths and yards
  • Hard-wearing patio slabs
About pressure washing

Why clean your render?

  • Transforms the house

    Clean white render makes the whole property look fresher.

  • Protects the finish

    Softwashing cleans without eroding or stripping the surface.

  • Kills the growth

    The algae is treated at the root, not just washed off the surface.

  • Stays cleaner for longer

    Because the growth is killed, it takes longer to come back.

Get a price without anyone knocking

Email us a photo and we'll measure the job remotely. We're always happy to visit if you'd prefer.

  1. Take a few photos

    The whole area, plus close-ups of the worst bits.

  2. Email them to us

    Add your house number and postcode so we can measure it.

  3. Get your estimate

    With honest advice on what the job needs.

  4. We book you in

    A date that suits you, and a visit first if it's needed.

Render cleaning questions

Anything else, just message us.

All FAQs
Why has my render gone green?

That's algae. It thrives on damp, shaded walls and under window sills where water runs down, which is why the staining often appears in streaks.

Will cleaning damage my render?

We clean render with a softwash, which uses cleaning solutions at low pressure rather than a jet wash, so the finish isn't blasted.

Can you clean K-Rend and silicone render?

Yes. We check the type of render first and use the right approach for it.

How quickly will I see results?

Most staining lifts on the day. Some deeper staining keeps fading over the following days as the treatment finishes working.

Will the green come back?

Eventually, especially on shaded walls, but killing the growth at the root means it takes longer to return.

Tell us about the job. We'll do the rest.

Free estimates, no one knocking on your door, and a clean you can see in the photos.

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Free, no-obligation estimate

Get your free estimate

Tell us a little about the job and we'll come back to you with a price.

What needs cleaning? (tick any)