How to prevent marks remaining on Krend after soft washing? (video)

June 16, 2023

A customer told us he’d treated KRend with Benz Lightning Cleanze biocide but some marks remained. He wanted to know why this could be and what we suggested he did.

We made these suggestions:

If it was a very hot day when the KRend render was treated with Lightning Cleanze, it may have "boiled off" soon after application.

This, combined with the porous nature of Krend may have meant that the chemical didn’t stay on the surface long enough to do it's job. So take these precautions:

1) Lightly pre-wet the surface (a garden hosepipe is fine) prior to application in hot conditions. This will cool the surface and means that the likelihood of Lightning Cleanze boiling off is significantly reduced.

It's important that the surface remain wetted by Lightning Cleanze for at least 30 minutes, and ideally, if the colonisation is severe, for 60 minutes, following application. This allows the chemical time to work.

2) Ensure your Lightning Cleanze mix is 4-5:1

3) Avoid applying in very hot sun, whenever possible. If you can, work either earlier or later in the day.

4) Ensure you brush Lightning Cleanze gently but firmly into the surface. This will ensure it gets deep into the biological growths that cause the "dirty" appearance.

No abrasive or aggressive scrubbing though. This is because wall render is quite a delicate building material and can be damaged by overly aggressive scrubbing.

5) Finally, rinse thoroughly.

6) For a perfect job, complete with a spray of Benz Bio Cleanze at 50:1 (40:1 in winter).

This will provide long-term biocidal protection against re-colonisation. Bio Cleanze will also continue to deep clean the render for several months following application. 

Click below to watch our explanatory video

We hope this information is helpful and sincerely wish you great success in your soft washing business,

Benz Team

Click here to get more practical soft washing how-to tips

How to find answers to most soft washing questions: Simply enter a relevant "keyword" or short phrase – e.g. keyword for the above link = "how to" – into our in-site Search Engine (magnifying glass icon on the main menu).

Click here to download our Product Documentation Pack (includes Application & Dilution guides, SDS, PDS, RAMS, PPE & Mask info, COSSH, sample Contract and more)

Order Benz Softwash chemicals & equipment online or by phone:

GB (England, Scotland, Wales)

Phone: 0800 70 74 222 

Online: www.benzsoftwash.co.uk

Ireland and other countries

Phone: 00353 214 622 978

Online: www.benzsoftwash.com

Lines open Monday - Friday, 9am – 5pm

Please note: The above numbers are for orders only (click here for tech support)

PS: Click here to set up your "Clean & Maintain" programme. After completing an initial soft wash treatment, put your customer on a "Clean & Maintain" ongoing maintenance programme. Your customers will enjoy a permanently clean property and you will enjoy a steady stream of repeat business.

This is clearly a win-win arrangement for you and your customers.

Click here to explore the extensive range of Benz softwash cleaning chemicals & equipment

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