Kitchen sink blocked? Causes, safe DIY fixes and when to call a plumber

Why kitchen sinks block in Malaysian homes

Malaysian kitchens cook a lot of fried food, rice and curries, and that shows up in the drains:

• Cooking oil and grease — poured hot, it cools and sticks to the pipe wall, then catches everything else.
• Rice and starchy scraps — they swell with water and pack into the trap.
• Small bones, seeds and tea leaves — they settle in the U-bend.
• Soap scum and detergent build-up that glues the mix together.
• Pipe problems — a waste pipe with too little slope, a sagging section or a cheap corrugated pipe that traps debris.

Five safe things to try first

1. Remove standing water with a cup into a bucket so you can see what you are doing.
2. Use a cup plunger. Seal the overflow or the second bowl with a wet cloth, then plunge firmly 10–15 times.
3. Clean the trap. Put a basin underneath, unscrew the bottle trap or U-bend by hand, empty it and rinse it in another sink. Most simple blockages end here.
4. Hot water and dish soap. Pour a kettle of hot — not boiling — water with a good squeeze of dish soap to soften grease. Boiling water can soften PVC joints.
5. Baking soda and vinegar can freshen a slow drain, but they will not shift a solid grease plug.

What not to do

• Don’t use caustic drain cleaners on a fully blocked sink. They rarely dissolve grease plugs, can damage old pipes and seals, and turn the trap into a hazard for whoever opens it next.
• Don’t keep plunging a double sink without sealing the other side — you just push water back and forth.
• Don’t force a wire coat hanger deep into the pipe; it can puncture corrugated or old pipes.

When to call a plumber

Call for help if:

• Water still stands after cleaning the trap.
• The sink blocks again within days or weeks.
• Other drains are slow too, or water comes up the floor trap when the sink drains — the blockage is further down the line.
• You hear gurgling or smell sewage around the sink.
• In a condo, neighbours report the same problem — the shared stack may be blocked, which is the management’s responsibility.

A plumber clears deeper blockages with an electric drain-cleaning machine (a rotating spiral) or high-pressure water jetting, then flushes the line and checks every connected drain. See our kitchen blockage service.

What unblocking costs in Kuala Lumpur

Stop it happening again

• Never pour oil down the sink. Let it cool, pour it into a bottle and throw it out with the rubbish.
• Scrape plates into the bin before washing, and use a sink strainer for rice and scraps.
• Flush with hot water once a week after washing up.
• Fit a grease trap if you fry a lot or run a home food business — it turns a recurring blockage into a quick monthly clean-out.
• Fix the pipe: if the waste pipe sags or is the corrugated type, replacing that section with a smooth pipe at the right slope often solves repeat blockages for good.