The answer to 'retaining wall mud' is that retaining wall mud, also known as mortar or grout, is a common issue that can arise with retaining walls. Retaining wall mud typically occurs when the mortar or grout between the wall blocks or stones becomes loose, cracked, or deteriorates over time. This can lead to the wall becoming unstable and potentially collapsing.
Some common causes of retaining wall mud include poor initial installation, exposure to the elements, freeze-thaw cycles, and settling of the wall. Symptoms may include visible cracks or gaps in the mortar, loose blocks or stones, and water seeping through the wall. To address retaining wall mud, the affected areas may need to be repaired or the entire wall may need to be rebuilt, depending on the severity of the issue.