Clogged Kitchen Sink? How to Unblock It Yourself (Before Calling a Plumber)

Quick Answer: How Do You Unclog a Kitchen Sink?

A clogged kitchen sink is annoying at the worst possible time — mid dishes, with a sink full of water. The good news: kitchen clogs are almost always grease, not something structural, and grease responds well to heat and basic tools.

What’s Actually Wrong With Your Sink? (Diagnosis)

Match what you’re seeing to the likely cause, then jump to that fix.

Once you’ve matched your symptom, work through the fixes below in order — easiest first.

What You’ll Need

Fix 1: Hot Water and Dish Soap Flush 10 MIN · EASY

Grease clogs respond to heat. This is the gentlest fix and often clears a slow drain completely on its own.

1. Boil a full kettle of water.
2. Squeeze a generous amount of dish soap directly into the drain.
3. Pour the hot water down slowly, in two or three stages rather than all at once, giving it time to break down grease as it goes.
4. Run the tap for a minute to check if it’s draining normally again.

Still clogged after the hot water flush? Time to plunge it.

Fix 2: Plunge the Drain 10 MIN · EASY

A standard cup plunger creates enough pressure to dislodge most kitchen clogs, especially in a double sink where you can seal off the other side.

1. Remove any standing water with a cup or small bowl if the sink is very full.
2. Block the second basin’s drain with a wet rag, and plug the overflow hole if your sink has one — this keeps pressure focused on the clog.
3. Add a couple inches of water to the clogged side so the plunger has something to push against.
4. Cover the drain completely with the plunger and plunge firmly 10–15 times without breaking the seal.
5. Check drainage, then run hot water to flush any loosened debris through.

Plunging didn’t clear it? Try dissolving the buildup with baking soda and vinegar.

Fix 3: Baking Soda and Vinegar 20 MIN · EASY

This classic combination fizzes and helps break down grease residue coating the pipe, and it’s gentler on old pipes than chemical drain cleaners.

1. Pour half a cup of baking soda directly down the drain.
2. Follow with half a cup of white vinegar and cover the drain immediately — the fizzing reaction works best contained.
3. Wait 15 minutes while it works on the buildup.
4. Flush with a full kettle of hot water to clear the loosened residue.

Still not draining? The clog is likely sitting in the P-trap itself.

Fix 4: Clean Out the P-Trap 20 MIN · MEDIUM

The P-trap is the curved pipe under the sink, and it’s designed to catch exactly this kind of debris. Opening it is messier but very effective.

1. Place a bucket directly under the P-trap to catch water and debris.
2. Loosen the slip nuts on both ends of the curved section by hand, or with pliers if they’re tight.
3. Remove the trap and empty the contents into the bucket, then clear any remaining gunk with an old toothbrush.
4. Reattach the trap, hand-tighten the slip nuts, then snug them slightly more with pliers — don’t overtighten plastic fittings.
5. Run water and check for leaks at both connections before considering it done.

When You SHOULD Call a Plumber

Most kitchen sink clogs are DIY territory, but call a pro when:

• None of the above fixes work. The blockage is likely further down the drain line, past what a plunger or P-trap cleanout can reach.
• Multiple drains in the house are backing up at once — that points to a main line clog, which needs professional snaking equipment.
• You smell sewage or see water backing up from other fixtures when you run the kitchen sink.

Fair pricing: expect $150–300 for a standard drain clearing, more if a main line snake or camera inspection is needed.

How to Stop It Happening Again

• Never pour grease down the drain. Let it cool in a container and throw it in the trash instead.
• Run hot water after every dish session to keep grease moving instead of settling.
• Use a sink strainer to catch food scraps before they reach the drain.
• Flush monthly with hot water and dish soap as routine maintenance, even if nothing’s clogged yet.

FAQ: Clogged Kitchen Sink

Is a chemical drain cleaner a faster fix than any of this?

It might seem that way, but use them sparingly and only as a last resort. They can damage older metal pipes and create a hazardous mix if you end up needing to plunge or open the trap afterward — which happens more often than the bottle implies.

Why does my kitchen sink drain slowly instead of fully clogging all at once?

A slow drain usually means a partial grease or food buildup that hasn’t fully blocked the pipe yet. It’s the easiest stage to fix — a hot water and dish soap flush often clears it before it worsens.

Why does my sink clog again just a few weeks after I clear it?

Recurring clogs usually mean grease is solidifying further down the drain line than a plunger or trap cleanout reaches. A monthly hot water and dish soap flush prevents most repeat clogs.

The Bottom Line

A clogged kitchen sink is almost always grease, and grease almost always yields to hot water, a plunger, or a quick P-trap cleanout — $0–10 in total against a $150–300 plumber bill. You just saved yourself a service call.

Keep going: How to Unclog a Bathroom Sink Drain · How to Fix a Leaky Faucet · more in our Plumbing fix guides.