Here’s the thing nobody tells you about a dishwasher: the machine that cleans your dishes almost never cleans itself. If your glasses come out cloudy, the inside smells a little swampy when you open the door, or there’s a gritty film on the bottom, the dishwasher isn’t broken — it’s just overdue for the 20 minutes of attention it quietly needs every month.
The good news is that this is one of the easiest “deep cleans” in the house. You’re not scrubbing for an hour — you’re pulling one part, running two cycles, and wiping two edges. Do it before the breakfast dishes and the machine works noticeably better by dinner.
Why it stops cleaning in the first place
Every wash, your dishwasher catches food scraps, grease, and minerals from your water and stages most of it in one place: the filter at the bottom. Over weeks, that gunk builds up, water can’t drain as freely, and instead of rinsing dishes clean, the machine starts redepositing a fine film back onto everything. Hard water makes it worse, leaving cloudy spots from dissolved calcium and magnesium.
The smell is the same story — trapped food in the filter and along the door seal is what you catch every time you open the door. None of it means the appliance is failing, just that the parts that collect debris haven’t been emptied lately.
Start with the filter — the step almost everyone skips
Most dishwashers built in the last 15 years have a removable cylindrical filter sitting in the floor of the tub, usually under the bottom spray arm. Pull the bottom rack out and you’ll see it. It twists out — typically a quarter-turn counterclockwise — and lifts free.
Rinse it under hot running water and use an old toothbrush to work soap and food out of the mesh. Bosch, Whirlpool, and most manufacturers recommend cleaning this filter about once a month, and it’s the single biggest reason a dishwasher suddenly “stops working.” Twist it back in until it locks — a loose filter lets debris back into the pump, so make sure it seats fully.
The two-cycle vinegar and baking soda reset
With the filter clean, run a simple back-to-back reset on an empty machine:
- Put 1 cup of plain white vinegar in a dishwasher-safe cup, upright, on the top rack. Run a hot, normal cycle. The vinegar cuts grease and dissolves the mineral film on the walls and racks.
- Sprinkle 1 cup of baking soda across the bottom of the tub. Run a short hot cycle. This deodorizes and gently scours anything the vinegar loosened.
One trick makes both cycles work better: run your kitchen tap until it turns hot before you start the dishwasher, so the wash begins hot instead of warming up cold water first. And keep the vinegar and baking soda in separate cycles — together they just fizz themselves flat.
Don’t forget the spray arms, edges, and seal
The spray arms are the spinning paddles that fling water at your dishes, and the little holes in them clog with mineral deposits and seeds. Wipe them down and poke any blocked holes clear with a toothpick so the water sprays in full jets again.
Then wipe two spots a cycle never reaches: the rubber gasket around the door and the lip of the tub just inside the door, below where the seal sits. That overhang stays wet and dark, which is exactly where mildew and grime collect. A damp cloth with a little dish soap is all it takes. If you’ve ever tackled a greasy air fryer basket, this is the same idea — the buildup hides in the part you don’t see.
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Keep it clean between deep cleans
A monthly reset holds up better with a few small habits. Scrape plates instead of pre-rinsing them spotless — modern detergent needs a little food residue to grab onto, and over-rinsing wastes water. Leave the door cracked after the final cycle so the inside dries instead of sitting damp, and give the filter a 30-second rinse once a week. Keep vinegar and a spare toothbrush in an organized under-sink cabinet, and the whole job stays a quick errand instead of a chore.
Frequently asked questions
How often should I clean my dishwasher?
Rinse the filter weekly and run a full vinegar-and-baking-soda reset about once a month. If you have hard water or run the machine daily, lean toward the more frequent end.
Can I use bleach to clean a dishwasher?
Skip bleach if your dishwasher has a stainless steel tub or interior parts — it can corrode and discolor them. White vinegar and baking soda are safe for both stainless and plastic tubs and handle the film and smell without the risk.
Why are my glasses still cloudy after cleaning?
Cloudiness is usually hard-water mineral buildup. A vinegar cycle removes most of it; if it returns quickly, a rinse aid or a water-softening additive helps keep new spots from forming.
Photo by Point3D Commercial Imaging Ltd.
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