01

What this symptom usually tells you

The most useful clue is whether the problem is isolated or appears elsewhere. A local restriction often responds to trap cleaning, a sink plunger or a small hand auger.

  • Test the second bowl if fitted
  • Check the dishwasher connection
  • Look for an accessible removable trap
  • Note whether greasy residue is present
02

Choose the next step, not the strongest option

For a flowing drain with soft grease residue, compare a labelled kitchen-sink treatment; for a stopped drain, direct removal is usually more controllable. A repeat blockage, sewage backup or several affected fixtures needs diagnosis rather than another product.

  • Check every nearby fixture
  • Identify anything already poured into the drain
  • Keep a note of gurgling, odour and water-level changes
  • Stop before wastewater overflows
03

Step-by-step approach

  1. 1

    Stop using the affected fixture

  2. 2

    Check whether the problem is isolated

  3. 3

    Remove only safely reachable debris

  4. 4

    Try one suitable method if the signs support it

  5. 5

    Escalate if flow is not restored or the symptom returns

Important safety point

Do not combine chemical products or use a plunger, snake or rod in liquid that may contain a corrosive cleaner.