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How to clean stains off mortar?

Hi there,

I wanted to ask what might be a good product / method for cleaning black stains from mortar. I am not sure what type of stain it is (probably mold). There are 3-4 places around the property where the staining occurs. The house is around 30 years old.

I was thinking something like this : https://www.bunnings.com.au/30-seconds-2l-one-step-spray-and-walk-away_p4460169 ? I had great luck getting mold stains off cladding with that.

Thank you in advance 🙂

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MitchellMc

Welcome to the Bunnings Workshop community @denisl. It's brilliant to have you join us, and many thanks for your question about removing stains.

30 Seconds 2L One Step Spray And Walk Away sounds like a good starting point. If you haven't already done so, you might like to hit the area with a high-pressure washer before the spray to see if it lifts any of the stains. Spray and walk away can take some time to work and might require a second application. I'd recommend you give it a go and let us know if you don't see any effect.

Please let me know if you have any questions.

Mitchell

denisl

https://www.workshop.bunnings.com.au/discussion/comment/37803#Comment_37803

Thanks very much for a warm welcome and a prompt and detailed reply. I will give this a go some time this week and report back 🙂

Cheers,

Denis

denisl

https://www.workshop.bunnings.com.au/discussion/comment/81137#Comment_81137

Howdy howdy,

I used a gerni to pressure wash all the stains and I have to say about 90% of it came off, thank you very much for your suggestion!

As for the remainder of the stains (in some areas only), would you recommend I give the spray and walk away a shot?

After pics (I am purposely selecting the worst areas, most of it is 100% gone):

Thank you again!!

EricL

https://www.workshop.bunnings.com.au/discussion/comment/105273#Comment_105273

Hello @denisl

For tough imbedded stains a second application of 30 seconds is sometimes necessary. I would also suggest using an Oates Long Handle Grout Brush to help with the cleaning.

If you need further assistance, please let us know.

Eric

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