How to Clean Block and Stone Retaining Walls
Retaining walls stay damp from the soil behind them, so algae and runoff stains are common.
Know the wall
Segmental concrete block, natural stone and poured concrete each clean a little differently.
Mind the drainage
Don't force water into weep holes or behind the wall face. Work from the top down with moderate pressure.
Efflorescence
White deposits are minerals carried out by moisture, not dirt — they need a different treatment.
What to avoid
- Blasting mortar or joints
- Plugging drainage openings
When to call a professional
Send photos and the rough length and height of the wall for a quote. See our driveway & concrete cleaning service.
What customers say
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Dan · Google Review
"Driveway looks amazing. Very surprised at the results. Team was very easy to work with. Excellent communication. Fair price. Let’s hope it holds up for a few years."
Mothball K. · Google Review
"I completed a quote sheet online for an estimate to pressure wash my house. First- Clean Pressure Washing responded quickly. Chris called me to discussed what service I need. He looked at my house on the Internet so he was able to see clearly the size of the house. I also added my driveway to the cleaning process. I was given a quote, verbally and written, which I signed on a DocuSign. They communicated with me via text and were right on time based on the schedule provided. They had a truck that had the solution in it for cleaning my house, which I was really happy about because they didn’t use my water. My driveway was really messy and they did a very good job on my house and driveway. I felt the quote was fair and competitive. They got all of the mildew off the house. It looks great so I shouldn’t have any problem with my HOA for a couple years. Thanks so much, Chris. I really appreciate the service you provided!!!"
Karla J. · Google Review
96 Google reviews from homeowners and businesses across Middle Tennessee. Read them all on Google.
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Related guides
- How to Clean a Concrete Pool Deck Without Harming the Pool
- Green or Black Algae on Your Driveway and Sidewalk: Causes and Fixes
- How to Clean and Seal an Exposed Aggregate Driveway
- How to Clean and Reseal Stamped Concrete
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