Mix for block-brick retaining wall

New to the forum and wanted to see if you guys can help me with the proper mix for removing mold-mildew from a retaining wall. I have Sodium Hypochlorite and elemonator on hand, what ratio would you recommend?

You could probably just hit it with a turbo nozzle. You can try and pre-treat with about 4% if you want. You might not need to though.

Welcome to the forum. There’s a lot of great info on here. There’s a search icon in the upper right side of the screen. You can find the answers to most questions you have.

Ok, I’ll try that. I appreciate the feedback. Looking forward to being a part of the forum. Thanks again

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As its painted, I wouldn’t turbo nozzle it personally.

I’d walk it with a pump spray, 50/50 SH and surfactant.

By the time you’ve got your pressure washer set up, it will come off nicely with the white fan tip 40°.


I didn’t even notice the paint so good call there Steve.

Make sure you know what the customer wants and set expectations. Is this a paint prep or do they just want the mildew off?

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I was actually going to do that but the plastic connector on my pump sprayer broke so I just used the soap nozzle with white tip. I let it set for about 15 minutes then washed. It’s actually my property, wanted to try it here first.

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It looks better but you would probably achieve much better results with a direct application like the other folks mentioned. Pump sprayers are cheap enough to keep 3 or 4 around all the time. You’ll enjoy not having to worry about what was mixed in your pump sprayer before mixing up something else and causing problems. I label mine for SH, OA, EBC, etc. Try to get ones with the good seals.


Yeah that’s a good idea. Appreciate all the feedback. Thanks guys…