How to unclog a kitchen drain. 3 steps that actually work.
Most kitchen sink clogs are the same two things: grease and food. Work these steps in order — they clear the majority of kitchen clogs without a service call, and we'll tell you exactly when to stop and call one.
What you'll need
Probably already under your sink:
- Cup plunger — flat-bottom, made for sinks (not the toilet flange kind)
- Dish soap — a good squirt cuts grease better than anything
- Bucket & towels — for the P-trap step, in case it's needed
- About 20 minutes — most of it waiting on hot water
The 3 steps, in order.
Do them in sequence — each one handles a deeper part of the clog. Stop as soon as water flows.
Plunge it right
Use a flat-bottom cup plunger — the kind made for sinks, not the flanged toilet kind. Seal the other opening first: stuff a wet rag in the disposal side or the second basin so your plunging pressure goes down the clogged drain, not out the other hole. Fill the sink with a few inches of water to cover the cup, then plunge straight up and down, hard, for about 20 seconds. This alone clears a surprising number of kitchen clogs.
Dish soap + hot water
Squirt a generous amount of dish soap straight down the drain, then follow it with hot tap water — not boiling. Dish soap is a grease-cutter, and kitchen clogs are mostly grease. The hot water melts the grease so the soap can carry it away. Give it a few minutes, then run the tap full-blast. Skip the boiling kettle: boiling water can soften PVC pipe and loosen glued joints. Hot from the tap is plenty.
Check the P-trap
Only do this if you're comfortable — there's no shame in stopping at step 2 and calling us. Put a bucket under the curved P-trap beneath the sink, unscrew the slip nuts by hand (or with channel-locks, gently), and dump out whatever's trapped in the bend. It's usually a gross little plug of food and grease. Screw it back together hand-tight, run water, and check for drips. If the nuts won't budge or anything looks cracked, stop — that's our job.
Skip this: chemical drain cleaners.
We get called to fix what these bottles cause. Here's the honest version.
They rarely clear kitchen clogs
Chemical cleaners are built for hair. Kitchen clogs are grease and food — the bottle just sits on top of the clog, fizzing at nothing.
They eat more than the clog
The same caustic chemistry attacks pipe walls, rubber gaskets, and disposal seals — especially in older plumbing. A $12 bottle can turn into a pipe repair.
They burn skin and eyes
Splash-back is real, and if you end up calling a plumber anyway, that chemical soup is now sitting in the trap we're about to open by hand.
When to call a plumber.
No shame in it — some clogs are symptoms, not the disease. Call if any of these sound familiar:
Water backs up elsewhere
Kitchen sink draining into the tub, or the toilet gurgling when the sink runs — that's a mainline problem, not a sink problem.
It keeps coming back
A clog that returns every few weeks means buildup or damage deeper in the line — usually a job for hydro jetting, not another round of plunging.
Bad smells from the drain
Sewer gas odor can mean a dry trap — or a cracked sewer line. A camera inspection shows exactly what's going on down there.
Kitchen drain FAQ
Straight answers, no sales pitch.
Is it safe to pour boiling water down a kitchen drain?
Not if you have PVC drain pipes — boiling water can soften PVC and loosen glued joints. Hot tap water is plenty for melting grease, and it's safe on every pipe material.
Does baking soda and vinegar unclog drains?
Mostly it's fizz theater. The fizzing looks like it's doing something, but it doesn't dissolve grease or food — the actual causes of kitchen clogs. Dish soap and hot water do far more.
How do I keep my kitchen drain from clogging again?
Never pour grease down the drain — wipe pans with a paper towel first, then wash. Run hot water for 15 seconds after each use, and scrape plates into the trash instead of relying on the disposal.
My garbage disposal hums but won't spin — is it clogged?
A hum with no spin usually means the motor is jammed, not a drain clog. Turn it off, press the red reset button underneath, and try the hex key in the bottom socket. If it stays dead, that's a repair or replacement — give us a call.
Tried it and still stuck?
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