How to Clean Dishwasher Filter: 9 Steps That Fixed My Cloudy Glasses

I used to think my dishwasher was dying. My glasses came out cloudy, there was a faint swampy smell every time I opened the door, and a gritty film clung to plates that were supposed to be clean. I tried switching detergents, adding rinse aid, and running hotter cycles. Nothing worked. Then a repair technician friend asked me one question I had never considered: “When did you last clean dishwasher filter?”

I stared at him blankly. I did not even know my dishwasher had a filter you were supposed to clean. Twenty minutes later, I pulled out a grey, slimy cylinder caked in food residue, and I finally understood where the smell and the grit had been coming from. After I learned how to clean dishwasher filter properly, my next load came out sparkling — the glasses were clear, the smell was gone, and the machine sounded quieter too.

If your dishes are not coming out clean, or your dishwasher smells off, a dirty filter is the most likely culprit, and it is also the easiest fix. Here is everything I learned, step by step.

Signs Your Dishwasher Filter Needs Cleaning

Your dishwasher will usually tell you the filter needs attention long before it stops working. The most obvious sign is gritty residue on dishes that were clean when they went in. That grit is food debris the clogged filter can no longer trap, so it gets sprayed right back onto your plates.

A sour or musty smell is another giveaway. Trapped food rots in the warm, damp filter housing, and every cycle circulates that smell through the machine. Cloudy glasses, a white film on plastic items, and water pooling at the bottom of the tub are all classic symptoms too.

In my case, the first sign was the smell, followed a week later by glasses that looked worse after washing than before. If you notice any of these, do not buy a new detergent first. Check the filter. It takes two minutes to look, and it is almost always the problem.

What Kind of Filter Does Your Dishwasher Have?

Most modern dishwashers have a manual-clean filter system, and that is the kind this guide covers. It usually sits at the bottom of the tub, underneath the lower spray arm, and it has two parts: a cylindrical upper filter with fine mesh and a flat lower filter that catches larger bits.

Some older or high-end machines have a self-cleaning filter with a built-in grinder. If yours grinds food itself, you may not have a removable filter at all — check your manual before you start pulling at things. But if you open the door, remove the bottom rack, and see a twist-out cylinder at the bottom, you have the manual kind, and you are in the right place.

One important rule applies to every model: never run the dishwasher without the filter properly installed. The filter protects the pump, and running without it can let debris damage the machine. Whirlpool’s own filter-cleaning instructions make the same point, and it is worth taking seriously.

What You Will Need to Clean Dishwasher Filter

You do not need special equipment, and the whole job takes about fifteen minutes. Gather these before you start: a soft sponge or cloth; an old toothbrush or another soft-bristled brush; warm water and a little dish soap; a small bowl or bucket for soaking; a towel for the floor, because some water always escapes; rubber gloves, if the idea of touching a slimy filter bothers you (it bothered me).

That is it. Do not reach for a wire brush, steel wool, or anything abrasive. The fine mesh in the filter tears easily, and a damaged filter is worse than a dirty one.

How to Clean Dishwasher Filter in 9 Steps

Here is the exact routine I now use every month. Read through it once before you start, so you know what to expect.

Step 1: Turn the dishwasher off. Switch it off at the controls. You are not working with electrics, but an accidental cycle start with the filter out would flood the kitchen, so do not skip this.

Step 2: Remove the bottom rack. Slide it all the way out and set it aside. This exposes the floor of the tub and the filter assembly. Wipe away any visible food bits sitting around it.

Step 3: Locate the filter. Look at the bottom of the tub, usually near the back or centre, under where the lower spray arm sits. You should see a cylindrical piece, sometimes with a handle or grip on top, sitting in a flat filter tray.

Step 4: Twist out the upper filter. Grip the cylinder and turn it about a quarter-turn counterclockwise, then lift it straight out. If it resists, wiggle it gently rather than forcing it — some models need a firmer twist than others, but it should come free without tools.

Step 5: Lift out the lower filter. The flat filter underneath usually lifts out with a gentle pull. Some models have small side tabs you press first. Set both pieces on your towel.

Step 6: Rinse both filters under warm running water. Hold them under the tap and let the water push loose debris out of the mesh. Pick off any stuck food with your fingers or the toothbrush. This step alone removes most of the buildup.

Step 7: Soak them in warm, soapy water. If the filters are greasy or smelly, soak them for ten to fifteen minutes in a bowl of warm water with a squirt of dish soap. This loosens grease and kills the smell far better than scrubbing dry.

Step 8: Scrub gently with the soft brush. Work the toothbrush over the mesh and around the edges, on both sides. Pay attention to the pleats and corners where gunk hides. Rinse again until the water runs clear and the mesh looks clean.

Step 9: Dry, refit, and run an empty rinse cycle. Shake off excess water and let the filters air-dry for a few minutes. Put the flat filter back first, making sure it sits under the locating tabs. Then drop the cylindrical filter into its opening and turn it clockwise until it clicks or locks into place. Give it a gentle tug to confirm it is locked — if it spins freely, it is not seated. Slide the bottom rack back in and run a short empty rinse cycle to flush out anything left behind.

That is the whole job. The first time I did it, I was annoyed at how simple it was — I had lived with dirty dishes for months because of a fifteen-minute chore I did not know existed.

How Often Should You Clean Dishwasher Filter?

Once a month is the right rhythm for most households. If you run the dishwasher daily, or you cook a lot of greasy or starchy food, every two to three weeks is better. A quick rinse under the tap between deep cleans keeps buildup from getting out of hand.

The filter can need cleaning sooner if you notice the warning signs from earlier: grit on dishes, a smell, or cloudy glasses. I now check mine on the first Saturday of every month, the same day I do my other appliance chores, and it has become a habit that takes less time than making coffee.

One honest note: the first clean after years of neglect can be unpleasant. If your filter has never been cleaned, soak it longer and expect to scrub more. After that first deep clean, monthly maintenance is quick and painless.

Mistakes to Avoid When You Clean Dishwasher Filter

I made several of these myself, so learn from my errors. Never use a wire brush or scouring pad on the mesh — it tears the fine screen, and a torn filter lets debris straight into the pump. Never run the machine with the filter missing or loose, even for one quick cycle.

Do not force a stuck filter. If it will not twist, check for a locking tab or a different twist direction in your manual; forcing it can crack the housing. And do not pour bleach into the dishwasher to “clean” the filter — bleach damages stainless steel interiors and rubber seals, and it does nothing for trapped food.

Finally, do not put the filter itself through a dishwasher cycle to clean it. That sounds clever, but it just circulates the same trapped debris through the machine. Hand-washing is the only way that actually works.

What If Dishes Are Still Dirty After You Clean Dishwasher Filter?

A clean filter fixes most problems, but not all of them. If dishes still come out dirty after you clean dishwasher filter thoroughly, work through these checks in order.

First, look at the spray arms. Food can block their holes, and a blocked arm leaves whole sections of the load unwashed. Spin them by hand and poke any clogged holes clear with a toothpick. Second, check your rinse aid — an empty dispenser causes spotting and poor drying.

Third, think about loading. Overlapping bowls trap dirty water, and tall items can block the spray arms from spinning. Fourth, check the water temperature: the tap nearest the dishwasher should run hot before you start a cycle, because the machine heats from that starting point.

I treat dishwasher care the same way I treat my other appliances — just as I keep a regular routine for how to clean a washing machine, a monthly dishwasher check keeps small problems from becoming repair bills.

How to Keep Your Dishwasher Filter Cleaner for Longer

The best maintenance is the boring kind. Scrape plates into the bin before loading instead of rinsing them fully — modern detergents actually need a little grease to work properly, but large food scraps belong in the bin, not the filter.

Run the dishwasher regularly rather than letting dirty dishes sit for days, because standing food hardens onto the filter. Once in a while, run an empty cycle on the hottest setting with the manufacturer’s recommended cleaner, which helps dissolve grease in the pipes and the filter housing.

And keep the habit: a monthly two-minute check beats an annual deep clean every time. Your filter, your dishes, and your nose will all notice the difference.

Conclusion

Learning how to clean dishwasher filter was the single most useful appliance lesson I have picked up in years. It cost nothing, took fifteen minutes, and fixed problems I had been blaming on detergent, water hardness, and a dying machine. The glasses are clear, the smell is gone, and I no longer dread opening the dishwasher door.

If you take one thing from this guide, let it be this: check your filter this week, even if your dishes seem fine. You might be surprised at what you find — and your next load will be better for it.

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