How to clean stain off render and brick?

Hello!
looking for some advice on how to clean what I believe is potentially stain off of this render pictured below? I have already used a high pressure cleaner to remove dirt, and still have these streaky marks. There is a wooden decking above so I believe it may be stain??

I also have another section elsewhere which is very obvious stain marks against bricks, would like to seek some advice on removing that as well if possible.

Thank you in advance!

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EricL

Hello @homeren

Thanks for sharing your question about cleaning stains off rendered brick. I propose using cleaning vinegar in a 50/50 mixture with water. I recommend testing it in a small corner first to make sure the mixture is not too strong. If it is, please add more water. Leave the mixture on the wall for about 10 minutes and then wash off with water and detergent.

Unfortunately, using anything stronger will start to affect the paint itself and could result in cracking and peeling.

If you have any other questions we can help with, please let us know.

Eric

homeren

https://www.workshop.bunnings.com.au/discussion/comment/45951#Comment_45951

Hi @EricL

Thank you for your reply!

I have followed your advice yesterday but it appears that it hasn’t removed any of the stains unfortunately.
What would be the next step from here?

Thanks so much for your advice!!

JacobZ

https://www.workshop.bunnings.com.au/discussion/comment/85463#Comment_85463

Hi @homeren,

You could try using Chemtech 1L Rust Off Remover with a scrubbing brush.

Like @EricL, I recommend testing it in a small section before committing to the full wall. Follow the instructions for mixing and adjust based on what you are seeing. Make sure you wear gloves, protective clothing, eye protection and a mask while working with this product.

If this doesn't work, you may need to look at painting the wall.

Let me know what you think.

Jacob

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