| Method | Effectiveness | Best for | |--------|--------------|-----------| | Manual grate removal & scooping | Very high (visible debris) | Gully traps, catch basins | | Pressure jetting (DIY or professional) | High (flushes sludge) | Blocked underground pipes | | Drain rods (screw-together flexible sticks) | Moderate (pushes, doesn’t dissolve) | Solid blockages near access points | | Chemical drain cleaners | Low to useless (outside water dilutes them) | Not recommended | | CCTV inspection + targeted jetting | Excellent | Recurring or mystery blockages |