How to clean stain off render and brick?

homeren

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!

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