How to softwash red algae stains on render

May 30, 2018

Benz Softwash supply softwash chemicals to the professional softwash cleaning trade

We've been asked about the best way to softwash red algae stains from wall render.

After softwashing, light red algae will go from wall render in a few days in warm weather and up to two weeks in winter.

Heavy dark red algae on render can be problematic as it often has multiple layers of black algae underneath. So be prepared to give multiple softwash treatments.

Benz Bio Cleanze – when used as a stand-alone softwash treatment at up to 25:1 dilution – will clean red algae from wall render in a few months. A second application after a month or so is often advisable to remove any remaining red algae stains.



The fastest results come from softwashing the worst of the red algae with Benz Lightning Cleanze at 5:1 dilution (go to 4:1 if test results indicate this to be necessary but take care and use full ppe as it is getting quite strong at that dilution).

Then follow up with a treatment of Bio Cleanze, after thoroughly rinsing Lightning Cleanze from the wall render, at 40:1 dilution. Biocidal Wash will continue cleaning the red algae through time and impart residual protection against recolonisation.

Click here to learn more about softwashing wall render on our dedicated render page

Click here to read a more in-depth article on softwashing red algae from wall render

We hope this information is helpful.

Cheers,

Ben, Leo & Fiona

Click Here to explore our popular softwash cleaning products

Benz Softwash Bio Cleanze DDAC biocide & Benz Softwash Lightning Cleanze SH sodium hypochlorite biocide





Leave a comment

Comments will be approved before showing up. Please revisit this Trade Tips post to read our response.


Also in Benz Trade Tips

Remove rust from stainless steel with Benz Oxy Cleanze
How to remove rust stains from stainless steel (video)

November 25, 2020

In this short video Ben demonstrates the treatment of a stainless steel door handle to remove rust stains – caused by contamination with carbon steel –by applying Benz Oxy Cleanze.

Click the link on this page to watch the video >>>

View full article →

Questions we are asked about soft washing – answered 03
Questions we are asked about soft washing – answered 03

November 18, 2020

Every week we receive a large number of questions about soft washing. And, as new contractors are coming into the business all the time, questions are often repeated.

So we thought it would be useful to put together the most frequently asked questions in this series of Trade Tips posts, for your easy reference.

Click the link on this page to read the full post ...

View full article →

Ben soft washing wall render with Benz Lightning Cleanze
Your soft washing questions answered - 02

November 11, 2020

Every week we receive a large number of questions about soft washing. And, as new contractors are coming into the soft washing business all the time, questions are often repeated.

So for your easy reference we thought it would be useful to put together some of the most frequently asked softwashing questions in this series of posts.

Click the link on this page to read the full Benz Trade Tips post ...

View full article →