TL;DR
Clean a dishwasher filter monthly, or every two weeks in a busy kitchen that runs the machine daily. A clogged filter is the most common cause of gritty dishes and a bad smell. Spray arm holes need clearing about twice a year on top of that.
How Often Should a Dishwasher Filter Be Cleaned?
Monthly is the standard recommendation for a household running the dishwasher several times a week. Every two weeks suits a machine running daily or a household that loads dishes without scraping first. Check it any time dishes come out gritty or the machine smells.
Source: appliance manufacturer guidance
Does Your Dishwasher Even Have a Removable Filter?
Most modern dishwashers do, and many owners have never looked. Older machines used a hard food disposer, essentially a grinder, which needed no cleaning but was noticeably louder.
Manual filters became standard as machines got quieter. If yours runs quietly, it almost certainly has a filter that needs cleaning, and if it has never been cleaned, that is likely the cause of any smell.
Look at the bottom of the tub under the lower rack. You will usually see a cylindrical piece that twists out, sitting in a flat mesh plate. Some machines have a single-piece filter instead. The manual shows the exact arrangement, and it is worth finding.
How Do You Clean a Dishwasher Filter?
Pull out the lower rack, twist the cylindrical filter counterclockwise, and lift it out along with the flat mesh screen beneath it. Rinse both under hot running water, scrub gently with a soft brush and a little dish soap, rinse again, and twist the filter firmly back into place until it locks.
Do not use a wire brush or anything abrasive. The mesh is fine and easily torn, and a torn filter lets debris reach the pump.
For heavy grease, soak the parts in hot water with dish soap for ten minutes before scrubbing. For hard water scale, soak in a solution of one part white vinegar to three parts water for twenty minutes, then rinse thoroughly.
Check the well underneath where the filter sits and remove any debris, glass fragments, or labels that have collected there. Wipe the tub floor while it is accessible.
Make sure the filter is locked back in. A loose filter lets food bypass it and reach the pump, which is a repair rather than a cleaning job.
Should You Rinse Dishes Before Loading?
Scrape, do not rinse. Modern detergents need some food residue to work against, and heavily pre-rinsed loads can actually clean worse. What matters is removing bones, pits, labels, and large scraps that clog the filter.
That is the balance. Scraping keeps the filter clear without defeating the detergent. Loading plates with whole pieces of food on them is what turns a monthly filter clean into a fortnightly one.
Clearing the Spray Arms
The spray arms have small holes along their length, and hard water scale plus food particles gradually block them. A blocked hole means a section of the rack gets no water, which shows up as dishes that are clean on one side of the machine and not the other.
Twice a year, remove the arms if the design allows. Most lower arms lift straight off, and upper arms usually unscrew by hand from a central nut. Check the manual first.
Hold each arm up to the light and look through the holes. Clear blocked ones with a toothpick or a straightened paperclip, working from the outside in, then rinse the arm through under a tap to flush loose debris out.
Soak scaled arms in a vinegar solution for thirty minutes first if you are in a hard water area. Refit them and spin them by hand to check they turn freely.
Running a Cleaning Cycle
Once a month, after cleaning the filter, run an empty hot cycle to clear the interior.
Place a dishwasher-safe bowl with a cup of white vinegar on the top rack and run a hot cycle with nothing else inside. Or sprinkle a cup of baking soda across the tub floor and run a short hot cycle instead.
Use one or the other, not both in the same cycle, and never add a bleach product to either. Bleach mixed with vinegar or with ammonia produces toxic gas. Bleach also should not be used in stainless steel tubs at all, since chloride pits stainless.
Wipe the door gasket and the edge of the tub by hand afterward. Those areas never get sprayed and collect residue, exactly like the gasket on a front-loading washing machine.
Where Dishwasher Smells Actually Come From
Work through the sources in order. The filter is first and accounts for most cases. Then the door gasket and the flat lip at the bottom of the door, which stays wet and never gets rinsed.
Then the drain hose and the air gap, if the installation has one. Then the garbage disposal, which usually shares the same drain line and is frequently the real source of a smell blamed on the dishwasher.
If a smell persists after all of that, and drainage is slow, it may be a plumbing issue rather than a cleaning one. That is a job for a plumber.
A Starting-Point Dishwasher Schedule
| Task | Typical cadence |
|---|---|
| Clean the filter | Monthly, or every two weeks with daily use |
| Wipe the door gasket and door lip | Weekly |
| Run an empty hot cleaning cycle | Monthly |
| Clear the spray arm holes | Every six months |
| Check and refill rinse aid | Monthly |
| Wipe the exterior and controls | Weekly |
| Check the drain hose and air gap | Yearly |
Where This Fits in the Kitchen Routine
The dishwasher is the appliance most often assumed to clean itself, which is why the filter goes untouched for years. The small appliance cleaning guide covers the machines around it, and the how often to clean everything in a home reference sets everything on one calendar.
Filter cleaning takes five minutes a month. When the kitchen needs a deeper reset, house cleaning services handle the parts that keep getting skipped.
FAQ
How often should you clean a dishwasher filter?
Clean a dishwasher filter monthly for a machine running several times a week, or every two weeks if it runs daily. Check it any time dishes come out gritty or the machine smells, since a clogged filter is by far the most common cause of both.
Where is the filter in a dishwasher?
At the bottom of the tub, under the lower rack. Most designs have a cylindrical piece that twists out counterclockwise, sitting in a flat mesh screen. Quiet modern dishwashers almost always have one. Older, louder machines used a grinder instead and have no removable filter.
Should you rinse dishes before putting them in a dishwasher?
Scrape rather than rinse. Modern detergents need some food residue to work against, and heavily pre-rinsed loads can clean worse. Remove bones, pits, labels, and large scraps, which are what clog the filter, then load without rinsing the plates clean.
Why are my dishes coming out gritty?
Usually a clogged filter, blocked spray arm holes, or both. A blocked filter recirculates food particles back onto the dishes, and blocked arm holes leave whole sections of the rack unwashed. Clean the filter first, then hold the spray arms up to the light and clear the holes.
Can you use bleach to clean a dishwasher?
No. Chloride bleach pits stainless steel tubs, and mixing it with vinegar or ammonia produces toxic gas. Use a bowl of white vinegar on the top rack during an empty hot cycle, or baking soda across the tub floor, but never both in the same cycle.
How do you clear blocked dishwasher spray arm holes?
Remove the arms if the design allows, hold each up to the light, and clear blocked holes with a toothpick or a straightened paperclip, working from the outside in. Rinse the arm through under a tap, and soak scaled arms in a vinegar solution first in hard water areas.
Five minutes a month keeps a dishwasher honest. Whole rooms take longer. Every home is different, so the real scope depends on size, condition, and what you want covered. Get a quote and we will walk you through it.