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Render Cleaning
& Surface Soft Wash

Render Cleaning

Cleaning render usually involves applying a low-pressure washer along with a suitable cleaning solution, or using soft washing techniques with specialised detergents. High-pressure washing is generally discouraged, as it can cause damage to the render. Mild bleach mixtures or dedicated render cleaning products are effective in removing dirt and stains, helping restore the building’s clean and refreshed appearance.

Cardiff Window Cleaner Ltd has many different solutions for all surfaces including all kinds of render, stone and brickwork to powder coated surfaces that look drab and faded after weathering.

Commercial Surface & Render Cleaning

Many make the assumption that when external surfaces become tired or weathered then the only way to make them look like new again is to either paint or replace the surface with new material. The two environmentally friendly products we use are ‘Benz Blackwash’ and ‘Algoclear Pro’. This Video highlights their effectiveness.

Common Reasons for Render Cleaning

  • Algae

Algae can leave unsightly green or red stains on your render. It grows in damp conditions and spreads quickly, making your walls look discoloured and dirty.

  • Dirt and Pollution

Over time, dirt from traffic, factories, and the environment can build up on your render. This doesn’t just make it look dull—if left alone, it can attract even more dirt and grime.

  • Moss and Mold

Moss, lichen, and mold often grow in shady or humid areas on exterior walls. Not only do they look bad, but they can also damage the render over time if not removed.

Cost Factors for Render Cleaning

  • Area Size

The larger the surface, the more time and materials are needed to clean it properly.

  • Type of Render

Some render types, like lime, are more delicate and require special care, which can increase the cost.

  • Dirt Level

If the render is heavily stained or dirty, it may take more effort and cleaning products to get it looking new again.

  • Access Challenges

For taller buildings or hard-to-reach areas, we may need extra equipment like scaffolding, which can add to the cost.

Contact us today to get a tailored quote!

Our Render Cleaning Technology

Blackwash is the only sodium hypochlorite based soft wash biocide that has full government approval from:
• The Irish PCD (Pesticide Control Division)
• The UK HSE (Health & Safety Executive)
• REACH (Registration, Evaluation, Authorisation & restriction of Chemicals)

We use Blackwash as a stand-alone soft wash solution, or in conjunction with power washing and/or Biocidal Wash.

surface cleaning service before/after surface cleaning service before/after
surface cleaning service before/after surface cleaning service before/after
Specs

Render Cleaning with BENZ Biocidal Wash

UK Health & Safety Executive (HSE) approval certificate number: 9936

Irish Pesticide Control Service (PCS) number: 9807

Specs

Render Cleaning with BENZ Blackwash

UK Health & Safety Executive (HSE) approval certificate number: 10161

Irish Pesticide Control Service (PCS) number: 9841

Render Cleaning FAQ

  • What is the best way to clean render?

The best way to clean render is by using specialised soft wash solutions such as Benz Blackwash or Algoclear Pro. These products are designed to break down and remove algae, moss, and dirt without causing damage to the surface. When combined with the right techniques, such as low-pressure washing and biocidal treatments, they can restore the render to its original condition.

  • Should old render be removed?

Not necessarily. Most old render can be cleaned effectively with professional cleaning solutions and techniques. This reduces the need for costly replacements or painting. However, if the render is severely damaged or structurally compromised, removal and replacement may be required.

  • Why does render get dirty?

Render accumulates dirt due to environmental factors like pollution, algae or moss growth, and exposure to the elements such as rain and wind. Over time, these factors can cause discoloration or streaking, making the surface look weathered and unsightly.

  • How often should you clean render?

The frequency of cleaning will depend on the location and exposure of your property. Typically, render should be cleaned every 2–4 years to maintain its appearance. Areas with high humidity or pollution may require more frequent cleaning.

  • Should you pressure wash render?

Render is a delicate surface, and high-pressure washing is not recommended as it can cause damage. Instead, low-pressure cleaning methods combined with soft wash solutions are preferred, ensuring the render is effectively cleaned without harm.

  • How much does it cost to have a render cleaned?

The cost of render cleaning varies depending on the size of the property, the extent of dirt or staining, and the cleaning method used. Contact us today for a customized quote tailored to your needs.

Additional Services We Offer

Roof Cleaning

Roof areas often contribute to staining on rendered walls due to run-off from moss and dirt. That’s why pairing render washing with roof cleaning makes perfect sense. It ensures your entire property faсade remains clean and stain-free. Our service also helps reduce water damage risks over time.

Moss Removal

Render surfaces are particularly prone to moss and algae growth, especially in shaded or damp areas. Our moss removal service tackles these organic stains at the root to prevent rapid regrowth. By combining it with render cleaning, we ensure your building stays fresher for longer.

Get in touch today

Request A Free Quote

Flexible Working

One off jobs or flexible contract terms to suit all businesses for all our cleaning services.

Safe Contractor

For peace of mind we are Safe Contractor Approved, fully insured and carry out all work to highest standards

Cleaner Cardiff

For cleaner windows, shops, factories and buildings in the Cardiff area - contact us with your requirements.

“Cardiff Window Cleaner Ltd are a team of professionals who have exceptional standards at what they do. They really do take pride in their work and have removed many a headache by keeping our clients happy over the years by just doing a high quality job. If you need a building externally maintained then look no further than the team at Cardiff Window Cleaner Ltd.”

Quality Assured Facilities Services

“We started using Cardiff Window Cleaner just over a year ago and we now use them on a lot of our sites in South Wales. We have been very impressed with their service and the quality of their work and also how quickly they respond to any issues. They are very easy to work with and we couldn't recommend them highly enough.”

Hazel Vine Property Management

“We used these guys for render cleaning on our house and were amazed by the results, total transformation. Communication was great throughout too. Highly recommend”

Tom Davies
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