How to remove rust stains from render

July 09, 2022

How to remove rust stains from render


Rust stains on wall render can be caused by flue pipes, satellite dishes, mild steel fixings, overflow pipes, etc. And they can cause an otherwise sound property to look very unsightly.

Quick tip: Our tests showed positive results from using Benz Oxy Cleanze to treat rust stains on all the renders we’ve tried it on except cement based render (e.g. sand and and cement render, which should be painted anyway – and in which case it too will be fine).

Because there are so many types of render, with varying constituents and formulas that constantly change, it is impossible for us to test them all. So, with your customer's permission, always test a small, out of the way area of any surface you are considering treating with any of our products – and obtain your customer's agreement that the result is acceptable to them – before treating the entire area.

 

In the picture below you can see rust stains caused by fittings on a flue.

Remove rust stains from render with Benz OxyCleanse Rust Removal Gel

We brushed Oxy Cleanze on and left it to work. Temperature was 15 ℃

OxyCleanze removes rust stains from render

 

Notice the difference in the photo below after only 3 hours (results would have been much faster in warmer conditions).

Clean rust from render with OxyCleanze rust removal gel

You can see that, although dramatically improved, there are still some faint marks, which will likely become less pronounced over time. You can see the shadow left behind as a result of the treatment, which is noticeable on some renders. A repeat application of our rust remover gel could be beneficial.

Quick tip: The key to successfully removing rust stains from renders is to apply Oxy Cleanze rust removal gel only to the specific areas that need treating.

On some renders and masonry there may be an undesirable bleaching effect. So always treat a small, inconspicuous test patch, and get your customer's agreement to treat the whole area, before completing the contract.

 

In the photo below you can see the stains caused by rust from a hanging basket bracket.

Rust stain on render caused by hanging basket

We treated the rust with Oxy Cleanze rust stain remover gel and and successfully removed the staining.

Rust stain on render treated with Benz OxyCleanse rust remover gel

However, notice the shadow left behind, which is a possible side effect of over-using Oxy Cleanze on this type of render. This photo illustrates the importance of applying rust remover gel only to the areas that need treating.

The photo below shows a similar bracket where we used a smaller quantity of Oxy Cleanze and the results, as you can see, were much improved.

Clean rust from render caused by hanging basket bracket

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

Ben, Leo, Fiona, Stevie & Anthony

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

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

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