What Should You Never Pour Down a Kitchen Sink?

Most kitchen sink blockages start with something that felt harmless at the time. A bit of leftover oil from the pan, the last of the coffee, a spoonful of rice. None of it looks like a problem going down, but pipes collect things slowly, and one day the water stops draining.

Here's what to keep out of the sink, and why it matters a bit more in Dubai.

Cooking Oil and Grease

This is the big one. Oil is liquid when it's hot, so it seems fine to pour away. Once it cools inside the pipe, it turns into a waxy layer that sticks to the walls. Every meal adds a little more, and food scraps stick to it. Eventually the pipe is half its original width.

Wipe greasy pans with kitchen paper first, then wash. For used cooking oil, let it cool, pour it into a jar or old container, and put it in the bin.

Coffee Grounds and Tea Leaves

Coffee grounds don't dissolve. They sink, settle in the bend of the pipe, and clump together with grease. A small amount every morning adds up fast. Put them in the bin or use them in a plant pot.

Rice, Pasta and Starchy Food

These swell in water. A few grains of rice are fine, but a plate scraped into the sink isn't. The same goes for pasta water with bits of pasta in it, mashed potato and bread. They turn into a paste that blocks the trap.

Fibrous Vegetables and Peels

Celery, onion skins, corn husks, potato peelings and banana skins can tangle in the pipe and trap other debris. Garbage disposal units handle some of this, but most Dubai flats don't have one, so these go in the bin.

Eggshells

People think they sharpen blades or clean pipes. In practice, the small pieces just settle in the trap and catch other waste.

Flour, Batter and Baking Mixes

Wet flour behaves like glue. A bowl of leftover pancake batter poured down the sink can set inside the pipe.

Medicines, Paint and Chemicals

Leftover medicine, paint, solvents, and strong cleaning products shouldn't go down any drain. They can damage pipes, and they don't belong in the water system. Take medicine back to a pharmacy and check with your building about disposal of paint and chemicals.

Also avoid mixing different drain cleaners. Bleach and other cleaners can react and release harmful fumes.

Why This Matters More in Dubai

Hard water leaves mineral scale on the inside of pipes. That rough surface holds onto grease and food much more easily than a smooth pipe would, so blockages build up faster here than in places with softer water. A habit that is fine in one country can lead to a slow drain within a few months in a Dubai kitchen.

Hot water doesn't fix it either. Hot water melts grease for a moment, but it solidifies again further down the pipe where you can't reach it.

Small Habits That Help

• Fit a mesh strainer over the plug and empty it into the bin.

• Scrape plates before washing.

• Run cold water for a few seconds after washing up to flush the line.

• Wipe oily dishes with paper first.

When the Sink Is Already Slow

If your sink drains slowly even though you've been careful, the pipe may already have a layer of scale or grease. A plumber Dubai will clear the line with a snake or high-pressure jet, removing both the blockage and the coating that causes the next one.

If the hot tap in the kitchen has also become weak or slow, don't assume it's the same issue. That often points to scale in the water heater or its connections, and you may need water heater repair in Dubai alongside the drain work.

Questions People Ask

Can I pour hot water and soap down the sink to dissolve grease?
It helps briefly, but the grease usually sets again further down the pipe.

Are coffee grounds really that bad?
Yes. They don't dissolve, and they clump with grease to form a stubborn blockage.

Is baking soda and vinegar enough to clear a clog?
It can freshen a drain and help with light build-up, but it won't clear a real blockage.

What if I already poured oil down the sink?
Run cold water and don't repeat it. If the drain slows over the next few weeks, get it cleared early.