Stop drain smell from washing machine now: Simple fixes
That unpleasant rotten egg or sewage smell coming from your washing machine is often a sign of a hidden build-up. It's usually caused by a combination of detergent residue, fabric softener, and grime lurking in the unseen corners of your appliance.
When we consistently use low-temperature washes – which are great for saving energy – we inadvertently create the perfect warm, damp breeding ground for mould and bacteria. Getting to the root of the problem is the first real step to getting rid of that drain smell for good.
Why Your Washing Machine Smells Bad
First, a smelly washing machine rarely signals a major breakdown. It's almost always down to everyday factors that have turned your appliance into an ideal home for odour-causing bacteria.
One of the biggest culprits is the sticky residue left behind by detergents and fabric softeners. When this gunk mixes with moisture, it becomes a feast for anaerobic bacteria, which produce hydrogen sulfide gas—the source of that distinctive rotten egg smell. It's a common issue, but thankfully, it's one you can fix.
The most common trouble spots for this smelly build-up include:
- The Rubber Door Seal: This gasket traps water, lint, and grime after every wash.
- The Detergent Drawer: Leftover soap can quickly turn into a slimy, mouldy mess.
- The Filter: If not cleaned regularly, it becomes a source of nasty smells.
Common Causes of Washing Machine Odours
To help pinpoint the issue, here's a quick summary of the usual suspects.
| Cause | Typical Smell | Primary Location |
|---|---|---|
| Mould & Mildew | Musty, damp, earthy | Rubber door seal, detergent drawer |
| Bacteria Buildup | Sewage, rotten eggs | Drain pipe, filter, inside the drum |
| Stagnant Water | Sour, stagnant | Drain hose, filter, bottom of the drum |
| Detergent Residue | Soapy, slightly off | Detergent drawer, internal hoses |
Identifying the specific scent is your best clue. A musty smell points to the door seal, whereas a sewage-like odour suggests it’s time to check the filter and drain.
A Practical Deep Cleaning Guide
Now that we know what's causing the smell, it's time to get cleaning. The most direct way to sort out a smelly washing machine is to give its key components a thorough deep clean. You’ll want to start with the rubber door seal, the detergent drawer, and the filter.
Run a Hot Maintenance Wash
One of the best fixes is a powerful maintenance wash. Pour about two cups of white vinegar straight into the drum, then add half a cup of bicarbonate of soda into the detergent drawer. Set the machine to run empty on its hottest and longest cycle.
This combination works wonders at dissolving built-up residue and killing off odour-causing bacteria.
For more helpful, easy tips to eliminate odor from your washing machine and ensure it stays fresh, exploring other expert advice is always a good idea.
Checking Your Plumbing for Deeper Issues
If you've deep-cleaned your washing machine but the drain smell is still hanging around, the problem might not be with the appliance itself. It's time to look deeper into your home's plumbing, specifically the standpipe and the P-trap.
The P-trap is the U-shaped bend in the pipe below the drain. It holds water to create a seal, blocking sewer gases from entering your home. If the P-trap is installed incorrectly or has dried out, this seal is broken, allowing unpleasant gases to waft into your utility room.
For more complex issues, knowing the common signs you need general plumbing repairs can help you figure out if it's time to call in a professional.
Simple Habits to Prevent Odours from Returning
Now that your washing machine is clean, keeping it that way is easier than another deep clean. Adopting a few simple habits will stop that drain smell from returning.
The most effective change is to leave the door ajar after every wash. This allows air to circulate, drying out the drum and preventing the damp conditions where mould and mildew thrive. It’s a game-changer, especially for front-loading machines.
Another key habit is to use the correct amount of detergent. Using too much creates a soapy residue that traps dirt and feeds bacteria. Stick to the manufacturer's recommendation.
When It’s Time to Call in a Professional
Sometimes, no matter how much you scrub, that nasty smell just won't budge. If you've tried all the DIY tricks and the odour lingers, it’s often a sign of a deeper issue that needs an expert eye.
A persistent sewage smell, for example, is a major red flag that could point to a blockage in your main sewer line or an issue with your home's vent stack. Tackling these complex plumbing systems is a job for a qualified professional.
Did you know that severe nuisance odours can fall under the Environmental Protection Act 1990? You can find out more about how councils deal with nuisance smell complaints on GOV.UK.
Don't let a stubborn smell get the best of you. Our guide on how to find a good plumber can help you find a reliable expert to get to the bottom of it.
DIY Fix vs Professional Help
Not sure if your smelly drain is a quick fix or a job for the pros? This table breaks down common symptoms to help you decide.
| Symptom | Potential DIY Solution | When to Call a Professional |
|---|---|---|
| Mild musty or sour smell | Run a hot wash cycle with vinegar. Clean the filter and gasket. | If the smell returns quickly after cleaning. |
| Smell is localised to the machine | Deep clean the drum, detergent drawer, and drain hose. | If you've deep-cleaned everything and the smell won't go away. |
| Strong sewage or rotten egg smell | Not recommended for a DIY fix. | Immediately. This could be a sign of a blocked sewer line. |
| Gurgling sounds or water backing up | This points to a problem beyond just the washing machine. | Immediately. This is a clear sign of a significant blockage. |
Ultimately, while DIY solutions are great for routine maintenance, you should never hesitate to call a professional for issues that involve your home's wider plumbing system.
Got Questions About That Washing Machine Smell?
Here are some quick answers to common questions about washing machine odours.
Can I Use Bleach to Clean My Washing Machine?
Yes, but be careful. A small amount of bleach run through a hot maintenance wash can kill mould and mildew. However, never mix it with other cleaners, especially vinegar, as this creates a toxic gas. Always check your machine's manual first, as some manufacturers advise against using bleach.
How Often Should I Clean My Washing Machine Filter?
As a rule of thumb, check and clean the filter every three to four months. If you have pets or regularly wash heavily soiled items, check it monthly. A clogged filter is a primary cause of bad smells and draining problems.
Why Does My Machine Smell Worse After I've Cleaned It?
This is surprisingly common. It usually happens when a deep clean dislodges a large amount of hidden grime and soap scum all at once. The loosened gunk creates a stronger smell as it washes away. Running a second empty, hot cycle should flush out the residue and clear the air.
If you've followed every tip and the smell just won't budge, it might be a sign of a deeper issue that needs an expert eye. The team at Go Assist can diagnose and fix tricky plumbing or appliance faults fast. Book a reliable engineer online and get your home back to normal.
