# How Do I Unblock a Greasy Kitchen Sink?

A [**greasy kitchen sink blockage**](https://fixhelpia.com/clearing-blocked-drains) **[phone]** is one of the most common household plumbing problems and also one of the most frustrating. One minute the water is draining normally, and the next it’s pooling around your feet while you’re trying to wash up after dinner. You might notice a slow drain at first, then bubbling noises, unpleasant smells, or even water backing up when you run the tap.
The good news? Most greasy kitchen sink clogs can be cleared at home with simple tools and a bit of patience. The even better news? Once you understand why grease causes blockages and how to remove it properly, you can stop the problem from returning.
In this blog, we’ll cover everything you need to know: why greasy sink clogs happen, what not to do, and step-by-step methods to unblock your sink safely and effectively. We’ll also go through prevention tips so you can keep your drains running smoothly long-term.

Why Does Grease Block a Kitchen Sink?
Grease is sneaky. When it’s hot, it looks like a harmless liquid. It slides down the drain easily, often mixed with dishwater, soap, and tiny food particles. But once it cools, it changes into a thick, sticky substance that clings to the inside of your pipes.
Over time, grease builds up like layers of wax. Then it catches other debris:

rice grains

coffee grounds

pasta

vegetable peelings

crumbs

soap scum

dirt and grime

Eventually, the pipe narrows so much that water can’t pass through properly. That’s when you get slow drainage, bad smells, and full-on blockages.
Grease blockages are especially common if:

you rinse oily pans directly into the sink

you pour leftover cooking oil down the drain

you use a lot of butter, fats, or heavy cooking oils

you have older plumbing with narrower pipes

your pipes have bends where grease can settle

Signs Your Sink Is Blocked With Grease
Greasy blockages behave a little differently from clogs caused by solid objects. Here are the most common warning signs:
1. Slow drainage
The sink empties, but painfully slowly.
2. Gurgling noises
You may hear bubbling or “glug-glug” sounds when water drains.
3. Smells that don’t go away
Grease traps food particles and bacteria, which leads to unpleasant odours.
4. Water backing up
Water rises in the sink when you run the tap, use the dishwasher, or empty a bowl.
5. The blockage keeps coming back
If you clear it temporarily but it returns quickly, grease buildup may be deeper in the pipe.

What NOT to Do When You Have a Greasy Sink Blockage
Before you start, it’s worth knowing what can make the situation worse.
Don’t pour more grease down to “push it through”
It won’t push it through. It will join the clog.
Don’t use boiling water on plastic pipes repeatedly
A single kettle of hot water is usually fine, but repeated boiling water can soften or warp certain pipe materials, especially if they’re older or poorly fitted.
Don’t rely only on chemical drain cleaners
Some chemical products can break down grease, but many don’t work well on thick grease clogs. They can also damage pipes over time and are unpleasant to handle.
Don’t keep running the tap hoping it will clear itself
That often leads to overflow and a bigger mess.
Don’t ignore it
A slow drain is your early warning. Grease clogs don’t magically disappear—they grow.

What You’ll Need to Unblock a Greasy Kitchen Sink
You can clear most greasy clogs using items you already have at home. Here are useful tools and supplies:

washing-up gloves

a bucket or bowl

old towels or rags

a plunger (cup plunger for sinks)

baking soda

white vinegar (optional but useful)

dish soap (degreasing type is best)

kettle or large pot for hot water

a screwdriver (for removing trap fittings if needed)

a drain snake / plumber’s auger (manual is fine)

a wire coat hanger (as a last resort tool)

Step-by-Step: How to Unblock a Greasy Kitchen Sink
Step 1: Remove Standing Water
If your sink is full or partially full, scoop out as much water as you can into a bowl or bucket. You’ll need access to the drain opening, and standing water will make it harder to work.
Tip: If the water is dirty and smelly, wear gloves and keep towels nearby.

Step 2: Try Hot Water + Dish Soap (The Grease-Breaking Combo)
This is one of the best first methods because it targets grease directly.
What to do:

Boil a kettle of water (or heat a large pot).

Squirt a generous amount of dish soap down the drain—about 2 to 4 tablespoons.

Wait 5–10 minutes so the soap can cling to the grease.

Carefully pour the hot water down the drain in stages.

Why it works:
Dish soap breaks down oils and fats. Hot water melts grease and helps flush it away.
Best for:

slow drains

mild grease buildup

early-stage clogs

If the water starts draining faster, repeat the process once or twice.

Step 3: Use Baking Soda and Vinegar (Foaming Action for Gunk)
This is a classic method that works best when grease is mixed with food residue and grime.
What to do:

Pour about ½ cup of baking soda into the drain.

Add ½ cup of vinegar.

Quickly cover the drain opening (a plug or a damp cloth works).

Let it fizz and work for 20–30 minutes.

Flush with hot water.

Why it works:
The bubbling action helps loosen sticky debris. It won’t dissolve thick grease like magic, but it can help break up buildup and clear minor clogs.
Best for:

mild clogs

smelly drains

slow drainage caused by buildup

If nothing changes, move to plunging.

Step 4: Plunge the Sink Properly (Most People Do It Wrong)
Plunging can be extremely effective for greasy clogs, but technique matters.
What to do:

If you have a double sink, block the other drain opening using a wet cloth or a sink plug.

Add enough water to cover the plunger’s rubber cup (a few inches is enough).

Place the plunger over the drain and make a tight seal.

Pump firmly up and down for 20–30 seconds.

Pull the plunger away quickly to release suction.

Test drainage.

Why it works:
Plunging creates pressure changes that can break up the clog or shift it enough to allow water to pass.
Best for:

clogs near the top of the pipe

blockages caused by grease + food particles

Repeat two or three rounds if needed.

Step 5: Clean the Sink Trap (Where Grease Loves to Hide)
If your sink is still blocked, the grease clog may be sitting in the trap (the curved pipe under the sink). This is a very common spot for greasy sludge to build up.
Before you start:

Put a bucket under the trap.

Lay down towels.

Wear gloves.

What to do:

Locate the U-shaped bend under your sink.

Unscrew the slip nuts on either side (usually hand-tight, sometimes need a wrench).

Carefully remove the trap.

Empty it into the bucket.

Scrub out the inside with an old brush or cloth.

Check for trapped food, greasy lumps, or debris.

Reattach the trap securely.

Run hot water and test drainage.

Why it works:
If the clog is in the trap, no amount of plunging will fully solve it until it’s removed.
Best for:

stubborn blockages

repeated greasy clogs

bad smells coming from the drain

If the trap is clean and water still won’t drain, the clog is likely further down the pipe.

Step 6: Use a Drain Snake (Best Tool for Stubborn Grease Clogs)
A drain snake (also called a plumber’s auger) can reach deeper clogs beyond the trap.
What to do:

Insert the snake into the drain opening (or into the pipe after removing the trap).

Push it gently forward while turning the handle.

When you feel resistance, rotate and push slightly to break through.

Pull it back slowly to remove debris.

Flush with hot water and dish soap.

Why it works:
The snake physically breaks up or hooks onto the clog so it can be pulled out.
Best for:

clogs deeper in the drain line

thick grease buildup

recurring blockages

This is one of the most effective home methods for tough clogs.

Step 7: Flush the System Thoroughly
Once the sink starts draining, don’t stop there. Grease can loosen and move, then settle again further down the pipe.
A good flushing routine:

Run hot tap water for 2–3 minutes

Add a small squirt of dish soap

Run hot water again

This helps wash away softened grease and reduces the chance of an immediate re-clog.

Extra Grease-Clearing Methods (If You Need More Power)
Method A: Salt + Baking Soda + Hot Water
This is slightly more abrasive than baking soda alone.

Mix ½ cup baking soda + ½ cup salt.

Pour it down the drain.

Leave for 20–30 minutes.

Flush with hot water.

It can help loosen greasy residue stuck to the pipe walls.

Method B: Wet/Dry Vacuum (If You Have One)
If you own a wet/dry vacuum, it can sometimes suck out the clog.

Set it to wet mode.

Seal the hose tightly over the drain.

Turn it on for 15–30 seconds.

This can pull up greasy sludge and debris quickly, especially if the clog is close.

Why Your Sink Keeps Blocking With Grease (Even After Clearing It)
If your sink keeps clogging, it usually means:
1. There’s still grease coating the pipe walls
The main clog may be gone, but the pipe is still narrowed.
2. Your kitchen habits are feeding the problem
Even small amounts of oil daily can rebuild quickly.
3. The blockage is further down the line
Sometimes the clog is in the main drain line rather than under the sink.
4. The pipes are poorly sloped
If water doesn’t flow fast enough, grease settles and solidifies.
5. Dishwasher discharge adds to the grease
Dishwashers often push hot greasy water into the same pipe, contributing to buildup.

How to Prevent a Greasy Kitchen Sink Blockage
Prevention is easier than dealing with a blocked sink—especially when it happens at the worst time.
1. Never pour oil or fat down the sink
This includes:

cooking oil

bacon grease

butter-heavy pan drippings

creamy sauces

oily soup leftovers

Instead:

let grease cool and solidify

scrape into a container or bin

2. Wipe pans before washing
Before rinsing a frying pan or baking tray, wipe it with a paper towel or disposable cloth to remove the oily layer.
3. Use a sink strainer
A cheap strainer catches:

rice

pasta

vegetable bits

coffee grounds

Less food down the drain means less material for grease to trap.
4. Run hot water after washing up
After doing dishes, run hot water for 30–60 seconds to help move oils through before they cool.
5. Do a weekly “degrease flush”
Once a week:

squirt dish soap into the drain

flush with hot water

This helps prevent grease buildup over time.
6. Avoid grinding greasy food in the disposal (if you have one)
Garbage disposals don’t “solve” grease. They just chop solids smaller—grease still coats the pipes.
7. Don’t treat your drain like a bin
Common culprits that should never go down the sink:

flour (turns into paste)

eggshells

coffee grounds

potato peels

fibrous vegetables

sticky rice and pasta

What If Your Sink Is Completely Blocked and Nothing Works?
Sometimes greasy clogs become so thick that home methods aren’t enough. If you’ve tried:

hot water + dish soap

baking soda + vinegar

plunging

cleaning the trap

using a drain snake

…and the sink is still blocked, the clog may be deeper in the plumbing system.
At that point, consider these signs that it’s time to call a professional:
You should get help if:

multiple drains in the house are slow or backing up

the sink backs up into another fixture

you smell sewage-like odours

plunging causes water to rise in other drains

you’ve cleared it repeatedly and it returns within days

A plumber can use stronger mechanical tools to clear grease buildup safely without damaging your pipes.

Common Questions About Greasy Sink Blockages
Can I use boiling water to unblock grease?
Hot water helps, but boiling water alone may not be enough. Pairing it with dish soap is far more effective because soap breaks down grease rather than just melting it temporarily.
Does vinegar dissolve grease?
Vinegar helps loosen grime and deodorise drains, but it doesn’t truly dissolve heavy grease on its own. It’s best used as part of a routine or combined with baking soda for minor clogs.
Why does my sink smell bad even after it drains?
Grease can coat the pipes and trap bacteria. Even if water flows, leftover residue can smell. Cleaning the trap and flushing with dish soap and hot water usually helps.
Can I use a wire coat hanger instead of a drain snake?
You can, but it’s less effective and may scratch pipes. If you do use one, straighten it carefully and avoid forcing it hard. A proper drain snake is safer and works better.
What’s the fastest way to clear a greasy clog?
For mild clogs: dish soap + hot water.
For stubborn clogs: clean the trap and use a drain snake.

A Simple “Greasy Sink Rescue Plan” You Can Follow Anytime
If you want a quick checklist, here’s a reliable order to follow:

Remove standing water

Dish soap + hot water

Baking soda + vinegar + hot water

Plunge properly (block other sink drain)

Remove and clean the trap

Use a drain snake

Flush with hot water + dish soap

This progression starts with gentle methods and moves to stronger ones without causing unnecessary damage.

Final Thoughts: Grease Clogs Are Annoying, But Very Fixable
A greasy kitchen sink blockage can feel like a disaster—especially when you’re busy and the sink is full of dirty water. But in most cases, it’s something you can fix yourself with basic household tools and a little methodical effort.
The key is understanding that grease isn’t like a normal clog. It doesn’t just “sit there.” It coats your pipes, collects debris, and builds up slowly until the drain can’t cope anymore. That’s why clearing the blockage is only half the job—preventing it from returning is what saves you time, stress, and money in the long run.
With the right approach—hot water and dish soap, proper plunging, trap cleaning, and a drain snake when needed—you can clear most greasy clogs safely. And with simple habits like wiping pans, using a strainer, and never pouring oil down the drain, you can keep your kitchen sink flowing freely for good.
If you’d like, I can also write a shorter “quick fix” version of this guide, or a printable checklist you can keep under the sink.