The answer to 'retaining wall mud' is that retaining wall mud, also known as efflorescence, is a common issue that can occur with retaining walls. Efflorescence is a white, powdery substance that forms on the surface of the wall, typically due to moisture and salts in the concrete or masonry materials. This can be caused by improper construction, poor drainage, or other environmental factors.
The main symptoms of retaining wall mud are a white, powdery substance on the surface of the wall, which can eventually lead to cracking, crumbling, or other structural issues if left untreated. To address this problem, homeowners can try cleaning the wall with a mild detergent or vinegar solution, improving drainage around the wall, or sealing the surface with a water-repellent sealant. However, if the issue is severe or the wall is showing signs of structural damage, it's best to call a professional landscaping or masonry contractor to assess the problem and recommend the appropriate solution.