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It's been over 5 years since limestone retaining walls and stone patio has been cleaned. They were covered in dirt, grime and algae. Using our proprietary solutions, we pretreated the areas and allowed the cleaning agents to do their work. We then cleaned down all the retaining walls and used our surface cleaner to lift the algae from the surface. We then proceeded to retreat with more of our proprietary solution to brighten the walls and surface. Bringing it back to its natural beauty. The end result speaks for itself.