Post actualizado el día octubre 25, 2026 by DeiviSanzPlay
Cleaning the dishwasher isn’t a whim of people obsessed with cleanliness. It’s the difference between an appliance that lasts you 5 years and another that starts to smell like a sewer after 18 months. And no, you don’t need to buy expensive products: with vinegar and baking soda you’ve got 90% of the job done.
I’m telling you this from the experience of having taken apart more than one filter with food residue stuck on like cement. Cleaning the dishwasher is one of those maintenance tasks that almost nobody does until the problem is already upon them.
Why your dishwasher smells bad (and it’s not the drain)
The musty, stale smell that hits you when you open the door comes from the buildup of food residue, grease, and detergent residue in areas you can’t see: the door seals, the spray arms, and, above all, the bottom filter. A biofilm film forms there where bacteria run wild.
Cleaning the dishwasher directly attacks that biofilm. If you just limit yourself to running a cycle with vinegar now and then, you’re patching the problem, not solving it. You have to get to the filter and the seals with your hands.
And watch out for hard water. If you live in a hard-water area, the mineral buildup on the heating element and the spray arms reduces washing efficiency and sends electricity consumption soaring. Cleaning the dishwasher in these cases isn’t about aesthetics, it’s about the appliance’s survival.
When to clean the dishwasher: signs you shouldn’t ignore
There’s no universal rule, but if you see these signs, stop going back and forth and get to it:
- The dishes come out with grit or sand. The filter is saturated or the spray arms have clogged holes.
- Glasses with opaque white spots. That’s stuck limescale. The dishwasher isn’t rinsing away the minerals properly.
- A smell when you open the door. There’s already active bacterial decomposition there.
- After a big family meal. An intensive cycle with very dirty loads leaves more residue than usual.
My recommendation: a deep clean every month or month and a half. If you have very hard water, every 3 weeks. And a quick filter clean every week, which takes 2 minutes.
Preparation before cleaning the dishwasher: don’t skip this
Before you get to work, empty the dishwasher completely. Racks, baskets, cutlery, everything out. You need full access to the bottom and the sides.
Cut the power from the electrical panel or unplug it if you have access. Even if you’re using liquids, any splash near connections is an absurd risk you can avoid.
Gather the supplies: white cleaning vinegar (the kitchen kind works, but the cleaning kind is more concentrated and cheaper), baking soda, an old toothbrush, a hard-bristle bottle-type brush, a microfiber cloth, and gloves. If you have very hard water, add a specific dishwasher descaler.
Open the window. Hot vinegar releases acidic vapors that aren’t toxic, but in a closed kitchen they’re unpleasant.
Step by step to clean the inside of the dishwasher
This is the process that truly removes ingrained dirt, not the one that looks pretty in magazines.
1. Vinegar in the hot cycle
Place a heat-resistant glass in the upper rack, filled with white vinegar. Run the longest, hottest cycle your machine has. The hot vinegar descales the limescale and breaks down the grease accumulated on the walls and the heating element.
2. Baking soda to finish
When it finishes, sprinkle a cup of baking soda on the bottom of the dishwasher and run a short cycle, also on hot. The baking soda neutralizes the acids and residual odors. If the smell persists after this, the problem is in the filter or the drain, not the interior.
3. Manual cleaning of the spray arms and filter
This is where 80% of the result comes from. Remove the spray arms (they usually twist and come out by pulling upward) and the bottom filter. Soak them in hot water with a splash of vinegar for 15 minutes. Then run the toothbrush through each hole of the spray arms. You’re going to be amazed at the amount of grease that comes out.
If the filter has stuck-on residue, scrub it with baking soda and a brush. Rinse well before reassembling.
4. Door seals
The rubber seals accumulate black mold that doesn’t come off with a simple cloth. Use a toothbrush with a paste of baking soda and water. Go over the entire fold of the seal. If the mold is deeply set, let the paste sit for 10 minutes before scrubbing.
5. Drain and lower area
Check that there are no objects (glass shards, toothpicks, olive pits) obstructing the drain. A clog there generates bad odors and strains the pump. Run hot water through the area to check that it drains well.
Cleaning accessories and external parts
The baskets and racks get greasy with use. Take them out and leave them soaking in hot water with a little dishwasher detergent for 20 minutes. Then scrub with a brush and rinse.
The outer door and panels: a microfiber cloth with a 50/50 water and vinegar solution. No abrasive scouring pads, which scratch the steel and then the mess shows.
The control panel deserves a barely damp cloth. Finger grease comes off easily with a drop of mild soap. Don’t pour liquid directly on the buttons.
And the base of the dishwasher and the floor around it: that’s where detergent splashes and residue fall that attract insects. Mop with hot water and a splash of vinegar once a month.
Mistakes that ruin your dishwasher (and that almost everyone makes)
Using bleach. Bleach attacks the rubber seals and makes them brittle. Short term it smells clean, medium term you’ve got leaks.
Pouring the vinegar into the detergent compartment. It’s useless, it goes out in the prewash. It has to go in a glass in the upper rack so it falls during the hot rinse.
Never cleaning the filter. It’s the most common mistake. The filter is the dishwasher’s lungs. If it’s clogged, everything else doesn’t matter.
Mixing vinegar and baking soda in the same cycle. They neutralize each other. First one, then the other, in separate cycles.
Ignoring the salt. If your dishwasher has a salt compartment, keep it full. It’s what regenerates the descaling resin and protects the heating element.
Real frequency of dishwasher cleaning
A deep clean once a month is enough for normal use. If there are many of you at home or you use it daily with full loads, every 3 weeks. The filter, rinse it every week under the tap.
The seals, a quick wipe every 15 days. And the exterior, when you see fingerprints or dust, which is a 30-second job.
Cleaning the dishwasher isn’t a weekend project. It’s 20 minutes a month that saves you 150-euro repairs and arguments over the smell in the kitchen. With vinegar, baking soda, and an old brush you have everything you need.
