Of every kitchen blockage we clear, the cause is nearly always the same, and it is almost never what the householder expects.
What actually happens
Cooking fat leaves the pan hot and liquid. It travels perhaps a metre down the waste pipe, cools, and stops being liquid. It coats the inside of the pipe in a thin film.
That film is sticky. Everything that follows — rice, coffee grounds, tea leaves, food fragments — catches on it. The layer thickens, the bore narrows, drainage slows, and one evening nothing goes down at all.
Critically, this is not a blockage in the pipe. It is a blockage made of the pipe's lining. That distinction is why plunging and rodding often do not fix it: they punch a hole through the middle and leave the walls coated, so it reblocks within weeks.
Why hot water and washing-up liquid do not solve it
They move the problem further along. Hot water and detergent re-liquefy the fat briefly, it travels a few more metres, and it cools again — now in a section that is harder to reach and often shared with other outlets.
It feels like a fix on the night. It is deferral.
Why we would rather you skipped the chemicals
Caustic drain products are the usual next step and they are a poor one.
- They generate heat, which can damage older pipework and seals
- They rarely clear a set grease layer properly
- They leave a caustic standing column in the pipe, which is genuinely hazardous for whoever opens it — possibly a technician who was not told
If you have already poured one in, say so before anyone starts work. It changes how the job is approached and it is a safety matter, not an admission of anything.
What actually clears it
Jetting — high-pressure water scouring the pipe wall — removes the layer rather than punching through it. Rodding is right for solid obstructions; grease needs scouring.
That is the difference between a drain that stays clear and one you call about again in six weeks.
The habit that prevents all of it
Do not pour cooking fat down the sink. Let it set in the pan or a tin and put it in the bin.
That single change removes the cause of most kitchen blockages. Supporting habits:
- Wipe greasy pans with kitchen paper before washing
- Fit a sink strainer and empty it
- Do not put rice, pasta or coffee grounds down the sink — all of them bind readily to an existing grease film
- Run cold water when using a waste disposal, not hot
Commercial kitchens
Everything above, at volume, with a grease trap in the middle of it. Two points worth making:
Service the trap on a schedule, not when it smells. By the time there is odour, grease has usually carried past it.
Scheduled jetting is cheaper than emergency attendance during service. That is not a sales line, it is the arithmetic of being closed for an evening.
When it is not your habits
If one particular drain blocks every few months no matter what you do, the pipe is the problem — usually a run laid too flat, occasionally a collapsed section or root intrusion. Clearing it again buys you months. Having the run investigated ends it.
Tell whoever attends how often it recurs. That single fact changes the diagnosis.
If it is blocked now: drain cleaning.
Related: the plumbing problems every Al Ain villa has · what to do in a maintenance emergency