Organic Matter on Render Requires Soft Washing

Dirty Render?

Let's Make It

Clean Render

Before

Dirty Render

After

Clean render

As trusted by:

How Do You Clean Render

Dirty Render

28th November 2021 General

How Do You Clean Render

There are so many different brands of render available in the UK, you may ask how do you clean render on my home or office building.

  • K-Rend
  • Monocouche
  • Weber
  • Parex
  • Sika

Apart from Sto Rend – all types of through coloured renders which have become infested with organic matter such as cyanobacteria, mould, moss and lichens need cleaning the same way.

A process known as Soft Washing is the answer to cleaning dirty render.

Soft Washing uses chemicals rather than pressure to treat and clean the organic matter off. By carefully mixing sodium hypochlorite (bleach) at between 2% -4% strength and combining it with greenwash which has anti-microbial additives in it. The softwash mixture when diluted with water and sprayed onto the renders surface at very low pressure, will kill off all organic matter.

The end result, is very clean and sanitised render.

When considering using other methods such as pressure washing to clean your render, you must ensure little or no pressure is used. Because high pressure is likely to cause irreversible damage to the render. Cold water pressure washing will only remove visible organic matter growth, leaving behind spores which will quickly strive to re grow thicker than before.

Different types of organic matter will be removed by Soft Washing, Trentophilia which can be seen as red or orange swathes across the rendered walls will soon disappear when you soft wash the surface. As will all other types of infestation.

When considering using an outside tradesman or contractor you are best asking them, how do you clean render?

You don’t want an uneducated person using the wrong type of equipment such as a pressure washer.

Instead search for a Professional Soft Washing company who has undertaken hours of training and bought the right equipment to do the work properly

Comments are closed.

Case Studies of Our Cleaning Work


See all case studies
  • Case Study

     Purple Rhino Author Logo

    St Margarets C of E Primary School – Crawley

  • Case Study

     Purple Rhino Author Logo

    Roof Cleaning Ashford, Kent

  • Case Study

     Purple Rhino Author Logo

    Cladding Cleaning Unit 1 Brentside Executive Park – Greater London

  • Case Study

     Purple Rhino Author Logo

    Odeon Pressure Washing Kettering

  • Case Study

     Purple Rhino Author Logo

    Portland Stone Cleaning – Slough

  • Case Study

     Purple Rhino Author Logo

    Roof Top Solar Panel cleaning

What our Clients Think


See all testimonials
  • As always, Purple Rhino have carried out the ultimate K-Rend, render cleaning to this extremely large apartment block in Margate. The through coloured render was extremely dirty but now thanks to the render cleaning team at Purple Rhino the buildings K Render looks like new.

    We have worked with Purple Rhino K-Rend Render Cleaning specialists for more than 5 years and are always delighted with the service and excellent results from the whole team.

    Dave Hazell Contracts Manager
    Bell Group Ltd, Margate, Kent

  • We used Purple Rhino for the first time in 2014 , very prompt service, great job done in cleaning the outside of our 15000 sq ft building , would certainly recommend Purple Rhino

    Gary Kersey
    European Flavours & Fragrances PLC, Hertfordshire

  • From my initial contact with Purple Rhino to the finish, their work was very professionally carried out. Their team arrived on the arranged date and completed the work to a very high standard. Also, at very short notice, they managed to carry out a large cleaning schedule over a weekend in order for the school to look it’s best for a visit by RIBA judges. This was safely completed while various areas were in use. Definitely a five star service and I would recommend this company.

    Ken Medlycott Site Manager
    Burntwood School, London

  • As always Purple Rhino provide excellent access solutions as well as giving excellent results with the proven techniques they use.

    Frank Foulger Facilities Manager
    Jet Group Ltd,

Purple Rhino Blog


See all Purple Rhino News

Our Recent Work

Call Us Email Us

Your buildings will
look brand new