How to Clean a Dishwasher Before Holiday Entertaining

This guide walks through how to clean a dishwasher the way appliance makers actually recommend: check the filter and spray arms by hand, then run the machine's dedicated maintenance cycle while it's empty. That combination, rather than just tossing in a pod and hoping for the best, is what keeps a dishwasher performing the way it did on day one.

The method is simple. Electrolux and AEG recommend running a long-duration cycle twice a month on an empty machine, or using the Machine Care program if the model has one, and note this matters most for households that lean on shorter programs, since that habit can lead to grease and limescale building up inside the unit (Electrolux). Whirlpool and KitchenAid recommend cleaning the dishwasher about every 30 days for best performance (Whirlpool). With holiday cooking about to push more loads through the machine each week, this is a reasonable point to get ahead of it rather than wait until dishes start coming out cloudy.

This is beginner-friendly work. The only tools involved are a soft damp cloth and a thin pick like a toothpick, and the steps that vary by brand are flagged below so the owner's manual stays part of the process rather than an afterthought.

What you'll need

• An empty dishwasher interior (no dishes loaded for the maintenance cycle)
• A soft, damp cloth
• A wooden toothpick or similarly thin, non-metal tool
• The owner's manual for the specific model
• A dishwasher-safe cleaning product, only if the manual or program calls for one

Two paths lead to the same result here. If the model has a Machine Care or Clean program, that's the one to use. If it doesn't, the longest cycle available, run empty, stands in for it (AEG).

Before starting: the one safety step that matters

Turn off the dishwasher and disconnect it from the main plug before cleaning the filter or spray arms by hand (Electrolux). This part of the job is beginner-friendly, but it still involves reaching into a machine that shouldn't be powered while hands are inside it.

How to clean a dishwasher filter and spray arms

A maintenance cycle can't make up for a clogged filter. Food, glass, or plastic fragments trapped there reduce cleaning performance and can damage the machine over time (Electrolux), and keeping it clear also keeps water flow strong enough that loosened food doesn't recirculate back onto the dishes (Whirlpool). This is why it comes before the cycle, not after.

1. Check what kind of filter the model has. Some dishwashers use a maintenance-free filter system that never needs manual cleaning, while others display a "Clean Filter" indicator light that signals when it's due (KitchenAid). Confirm this in the manual before assuming the filter pulls out.

2. Clear visible debris by hand first. Larger food scraps or foreign objects sitting around the filter area, including anything hard like olive pits or a stray toothpick, should be picked out and discarded before the filter itself gets removed (Whirlpool).

3. Remove and clean the filter following the manual's unlock method. Twist-lock, lift-out, and multi-piece filter systems all differ by brand and model, so this step genuinely does depend on the specific manual rather than a generic motion. Electrolux notes some models use up to three separate filter pieces that come apart in sequence (Electrolux).

4. Check the sump for anything that slipped past. Look rather than reach: avoid pressing fingers into standing water or around anything that looks sharp, and use the thin pick to nudge debris loose instead.

5. Reinstall the filter and confirm it's seated properly. The lower filter should sit securely in place and the upper filter assembly should lock before the dishwasher runs again. Whirlpool specifically warns against operating the machine with filters improperly installed, since it can damage the unit (Whirlpool).

6. Move to the spray arms. Clogged holes cut cleaning power the same way a clogged filter does. How to clear them depends on the model: some upper spray arms stay in place and just need a toothpick worked gently through each clogged opening, while others detach for a rinse under running water (Electrolux). On detachable models, the arm typically releases by pressing upward while turning it, and locks back in with the reverse motion. Confirm which type applies before pulling on anything. If there's a cutlery basket sitting above the top spray arm, it usually needs to come out first by releasing the stoppers on its slide rails.

A wooden toothpick is for clearing a clogged hole, nothing more. Don't use it, or anything metal, to scrape at buildup, pry a spray arm loose, or force a part that isn't moving freely, and skip abrasive pads, strong chemicals, scourers, or solvents on any dishwasher surface or component (Electrolux). If a filter or spray arm won't release with reasonable hand pressure, stop and check the manual rather than forcing it.

Before running anything, the lower filter should sit flush, the upper filter assembly should click or lock into place, and the spray arm holes should look clear when you look up through them. That's the signal the machine is ready for its cycle.

Run the dishwasher's cleaning cycle

With the filter and spray arms clear, run the dishwasher empty on its Machine Care or Clean program, or the longest cycle available if the model doesn't have a dedicated one. Shorter, convenient daily programs don't give grease and limescale the same chance to clear out, and households that lean on those shorter cycles are the ones manufacturers flag as most prone to buildup over time (Electrolux). Running the longer cycle periodically is the straightforward way to remove grease and limescale from a dishwasher before it builds up into something harder to shift.

Whether a cleaning product goes in with that cycle depends entirely on the model, so check the manual rather than assuming. Whirlpool and KitchenAid recommend running a dishwasher cleaner like affresh about once a month to prevent filming, spotting, and odor (Whirlpool), while Electrolux and AEG machines lean on their Clean and Care program on its own (Electrolux). Use whichever the manual specifies for the model in question, and don't swap in regular dish detergent for a dedicated cleaner.

On frequency, check for an onboard indicator light or manual guidance first. Without either, the manufacturer defaults differ: twice monthly from Electrolux and AEG, versus roughly every 30 days from Whirlpool and KitchenAid. Either schedule is a reasonable starting point; the household's own brand and habits should decide which one applies.

While the cycle runs, wipe the rubber door gasket with a soft damp cloth. It's an area the spray cycle doesn't reach well, and residue tends to collect there even when the rest of the interior looks clean (AEG).

Once the cycle finishes, open the door and take a look. A clean run generally shows no greasy film along the interior walls, no lingering odor, and water that's drained out completely rather than pooling at the bottom. These are reasonable signs the cycle did its job, not a guarantee, so don't panic over a faint smell on the first try if everything else checks out.

Keep the routine going through entertaining season

Attaching the maintenance cycle to a date that already exists, like the first of the month or trash night, makes it far less likely to get skipped once holiday cooking adds extra loads to the week.

One gap worth planning for: if a load sits only partially full during a busy stretch of entertaining, run a Rinse and Hold or Rinse Only cycle without detergent every 24 hours until there's enough for a full load. That keeps food from sitting and souring between runs, and prevents the odor buildup that comes with a half-full tub left overnight (Whirlpool). It's a small addition to the dishwasher maintenance routine, not a separate project, and it only matters during the stretch where loads pile up faster than usual.

What to check after cleaning

Success looks like an interior free of grease film, a gasket that's been wiped down, a filter sitting flush and locked, and no smell when the door opens.

If odor or spotting is still there after a full filter check and empty cycle, that's a sign of something past routine buildup. Check the manual's model-specific troubleshooting section rather than running the cycle again and again or reaching for a stronger cleaner than the one it calls for.

Don't overthink the schedule beyond that. Follow the manual or indicator light where the model has one; where there isn't one, pick a monthly or twice-monthly rhythm based on which manufacturer's guidance matches the brand in the kitchen, and stick with it.

If the dishwasher is leaking, not draining, or showing an error code, that's outside what a filter check and empty cycle can fix. Stop, open the manual's troubleshooting section, and call a service technician if the problem doesn't match anything listed there.