5 Easy Ways to Fix a Smelly Kitchen Sink Drain: Follow Our Complete Guide

It's the bane of any wannabe Masterchef's existence - the smelly kitchen sink drain. And it's not just because kitchen sink stink is unpleasant. That odourous sink drain smell is a virtual red flag alerting you to likely plumbing problems that need urgent attention.

Foul smells from beneath the kitchen sink drain cover often come from a variety of sources. In addition to those stinky drain smells, you might notice slow drainage or even sewer gases escaping back into your kitchen.

It probably comes as no surprise, but these smells can make the entire house smell bad if you leave them for too long.

The good news? You don’t always need harsh commercial drain cleaners to kill them dead. From the classic baking soda and vinegar method to more technical approaches like drain snakes and garden hoses, here are 5 natural ways to clean smelly drains that help extend your sink’s life and keep your kitchen fresh and hygienic. Then you can say goodbye to that bad smell once and for all.

Common Sources of Smelly Sink Drains

Before we look at how to conquer your stinky sink problem, here are some of the more common reasons why it’s happening in the first place:

• Food scraps: Trapped in the P-trap or drain pipes, they rot and cause your smelly kitchen sink drain dilemma.
• Grease and oil: Avoid disposing of them, either in significant volumes or even trace amounts, down the sink. They stick to the sides of pipes, trap debris and create a smelly drain problem.
• Soap scum: Dishwashing liquids build up in kitchen sink drains and feed bacteria.
• Dry P-trap: Allows sewer gases to rise and make the house smell bad.
• Slow drainage: Caused by a blocked drain, restricting water flow and worsening odours.

Addressing these issues, including dealing with a blocked drain quickly, helps prevent smelly drains in the long term.

1. Pour Hot (Not Boiling) Water Down the Drain

One of the quickest ways to fix a smelly sink drain is by pouring hot water. It can be quite effective at melting away grease and soap build-up that clings to your drain pipes. If you have PVC pipes, avoid using boiling water as it can cause problems.

But to clean smelly drains with non-PVC pipes, simply boil the kettle, pour half down the sink, wait a few minutes, then pour the rest. This helps remove odours, clear minor clogs, and restore proper drainage.

Do this once a week to prevent smelly drains. If you’re boiling the kettle for a tea or coffee, simply pour the leftover hot water down the drain once you’ve had your cuppa. It’s an easy way to keep your kitchen sink draining properly without calling a professional plumber.

2. Use Baking Soda and Vinegar

One of the most effective DIY methods for cleaning drains and fixing a stinky sink is with a homemade drain cleaner consisting of baking soda and vinegar.

Start by pouring half a cup of baking soda into the kitchen sink drain. Then add a cup of white vinegar or hot vinegar, and before too long, you’ll start to hear it fizz. This reaction breaks down any small food particles, soap scum, and bacteria that are causing the sink drain smell.

Allow the mixture to sit for at least 15 minutes. Finish by pouring hot (not boiling) water down the drain. This method is safe for most kitchen sink setups and also works wonders on smelly bathroom drains and shower drains.

3. Use Everyday Items to Clean Your Drain

Thankfully, you don’t always need to head to your local Bunnings or the cleaning products aisle at Coles for this next method. You can tackle a smelly sink using common household items from the fridge or pantry. Try the following:

• Lemon juice: Freshen the drain and break down mild odours.
• A few ice cubes: If you have a garbage disposal, these can help clean the blades and scrub away buildup.
• Dish soap and very hot water: Pour water (again, not boiling hot water if you have PVC pipes) and dish soap down the drain to cut through grease.
• Soak the drain plug: Remove and soak in white vinegar to eliminate trapped bacteria.

These simple steps help keep your sink smelling fresh and your plumbing system clear of gunk and grime. Just as it should be.

4. Check and Clean the Drain Plug and Strainer

In most Australian homes, kitchen sinks don’t have an overflow hole like bathroom sinks do. Instead, they use a drain plug and a sink strainer basket to catch food particles and control water flow. Over time, these parts can trap grease, food scraps, and soap scum, leading to a smelly kitchen sink drain.

To fix the problem, remove the plug and strainer, soak them in vinegar, and scrub away any build-up with dish soap and hot water.

Cleaning these components regularly helps prevent a blocked drain and keeps your sink smelling fresh and draining properly.

5. Use a Drain Snake to Clear Stubborn Smells

If your sink drains slowly, or none of the above methods can resolve the problem, you may have a blocked drain deeper in your plumbing system.

A drain snake can be a very effective way to break up clogs in the P-trap or beyond.

Only consider commercial drain cleaners as an absolute last resort. They can damage pipes and harm your health. Stick with mechanical cleaning methods to keep your sink healthy and smelling clean.

When to Call a Licensed Plumber for a Smelly Drain

After all these plans of attack, and even if you have resorted to caustic cleaning products, you may need to call a plumber if your sink still smells bad. Chances are, there may be a more serious issue such as sewer line problems or a damaged P-trap.

Only licensed plumbers can legally handle regulated plumbing work in South Australia. This includes anything involving the sewer line or changes to your drainage system.

They can provide you with a thorough inspection, clear a clogged drain quickly, and fix the root cause of the smelly drain problem. They may use a professional drain cleaning service or a CCTV drain camera to find hidden blockages.

Don’t risk DIY if the smell keeps returning. You might risk breaching your home and contents insurance policy, voiding product warranties and incurring heavy penalties. Avoid all that hassle by calling a licensed plumber ASAP.

Keep Your Sink Healthy and Smelling Fresh

You don’t have to live with a smelly kitchen sink drain. No matter what the initial cause, simple fixes that include boiling water, baking soda, and vinegar can make a bigger difference than you might expect.

Clean your drain plug, use a sink strainer to catch food particles, and flush your sink weekly to prevent build-up. Avoid dumping oil, coffee grounds, or large food items down the sink.

With regular maintenance and the right tools, you can prevent smelly sink drains and keep your kitchen sink working efficiently for years to come.

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