If the drain still runs slow after two rounds of this process, the mud may have compacted into a sand/gravel layer. In that case, call a professional with a hydro-jetter—it’s the only tool that truly blasts mud into solution.
Why Mud is a Unique Drain Problem Mud doesn’t stick to pipe walls like fat or hair. Instead, it settles at low points, elbows (P-traps), and horizontal runs. Over time, it compacts into a dense, sand-like layer that restricts water flow. Pouring standard chemical drain cleaners (acid or lye-based) on mud is ineffective and often counterproductive —acids may react with clay minerals to form a harder mass, while caustics simply pass over it. how to dissolve mud in drain
You cannot dissolve mud with chemicals. You must liquefy, suspend, and flush it. The winning combination is: Snake → Boiling soapy water → Plunge → High-pressure flush → Repeat. If the drain still runs slow after two