How to Clean Dish Washer: The Complete Maintenance Guide

A dishwasher that smells like wet socks is almost always one thing: a clogged filter you have never touched. Knowing how to clean dish washer components correctly takes about 25 minutes once a month and adds three to five years to the machine’s lifespan, according to KitchenAid’s own service data. Skip it and you will see cloudy glassware, a pink slime ring around the door gasket, and progressively worse drainage. The good news: you already own everything you need.

Why Dishwashers Get Dirty in the First Place

Modern dishwashers run at 120 to 150°F, which is hot enough to dissolve grease but not hot enough to sterilize. Every cycle deposits food fragments in the bottom filter, biofilm in the spray arm holes, and limescale on the heating element. Rinse aid residue accumulates in the dispenser door. Add hard water above 7 grains per gallon and the cumulative gunk multiplies fast.

Manufacturers including Bosch, Whirlpool, and GE recommend a deep clean every 30 days for households running the machine four or more times per week. If you use pods rather than gel detergent, bump that to every three weeks because pods leave more film.

Tools and Supplies You Need

Almost everything is already under your sink:

• 1 cup of plain white vinegar (5 percent acidity)
• 1 cup of baking soda
• An old toothbrush or grout brush
• Microfiber cloths
• A dishwasher-safe cup or bowl
• Rubber gloves (the filter holds onto sharp glass shards)
• Optional: a dishwasher cleaner tablet like Affresh or Finish, $4 to $9 per pack

Avoid bleach if your dishwasher tub is stainless steel. Chlorine pits the metal and voids the warranty on most Bosch and Miele units.

Step 1: Empty and Inspect

Pull both racks out completely. Look for chunks of food on the spray arm holes, label residue on the back wall, and any standing water in the bottom basin. Standing water means the drain is partially clogged and needs the filter pulled before anything else.

Wipe the door gasket with a damp cloth. Pink or black slime here is Serratia marcescens, a harmless but smelly bacteria. A quick wipe with a vinegar-soaked cloth knocks it back.

Step 2: Pull and Clean the Filter

This is the single most impactful step and the one most people skip. The filter sits in the floor of the tub under the bottom spray arm. On most Bosch, KitchenAid, and Maytag models you twist the cylindrical filter counterclockwise about a quarter turn and lift it out. A flat coarse filter usually pops out underneath.

Run both pieces under hot tap water and scrub with the toothbrush. Coffee grounds, eggshell flakes, and tiny bone fragments are the usual suspects. Heavy buildup may need a 10-minute soak in a sink full of warm water with a tablespoon of dish soap. Reinstall by reversing the twist and feeling for the click.

Step 3: Clean the Spray Arms

Lift off the lower spray arm by pulling straight up. Most models have no clip. Hold it under the tap and use a toothpick or paperclip to clear each spray hole. Hard water deposits look like white crust around the openings. If a hole stays blocked, soak the whole arm in vinegar for 20 minutes.

The upper spray arm usually unscrews with a quarter turn. Check it the same way. Mineral buildup here causes the dreaded “top rack still dirty” complaint.

Step 4: Run a Vinegar Cycle

Place an upright dishwasher-safe cup containing one cup of white vinegar on the top rack. Do not add detergent. Run the hottest cycle the machine offers, usually labeled Sanitize, Heavy, or 170°F. The vinegar disperses through the spray system and dissolves limescale, soap scum, and grease film.

Once the cycle ends, sprinkle one cup of baking soda across the floor of the tub and run a short hot rinse. The baking soda neutralizes residual odors and brightens the stainless interior.

Step 5: Wipe Down the Exterior and Controls

Mix a 50/50 vinegar and water solution in a spray bottle. Mist a microfiber cloth, never the panel directly, and wipe the control buttons, handle, and door front. For stainless exteriors, follow up with a tiny drop of mineral oil rubbed in the direction of the grain to restore the satin finish and prevent fingerprints.

Weekly Habits That Reduce Deep Cleans

A few small habits keep the machine clean between monthly resets:

• Scrape plates of solids before loading, but skip the pre-rinse — modern detergents need food residue to grip onto
• Run the kitchen sink hot for 10 seconds before starting a cycle so the machine fills with hot water immediately
• Leave the door cracked an inch after each cycle to let moisture evaporate
• Use rinse aid even if you have soft water — it improves drying by 40 percent
• Refill the salt reservoir on European models when the indicator light comes on

When Cleaning Is Not Enough

If your dishwasher still smells after a thorough clean, check the air gap on the countertop or the high loop in the drain hose under the sink. A sagging drain hose lets dirty water from the disposal back-siphon into the tub. Reposition it so the loop sits above the sink basin.

Persistent cloudy glassware after cleaning usually means hard water above 10 grains per gallon. Either install a softener or switch to a phosphate-based detergent like Cascade Platinum Plus.

Frequently Asked Questions

How often should I learn how to clean dish washer parts?

Run the full deep clean monthly if you wash dishes four or more times per week. Bi-weekly if you have hard water above 10 grains per gallon or use the machine daily.

Can I use bleach to clean a dishwasher?

Only if the interior tub is plastic. Chlorine bleach pits stainless steel tubs found in most Bosch, Miele, KitchenAid, and Whirlpool models built after 2010. Vinegar is the safer universal option.

Why does my dishwasher smell like rotten eggs?

Almost always a clogged filter or a sagging drain hose letting waste water back-siphon. Pull the filter, rinse it, and check that the drain hose has a high loop above the sink basin.

Will a dishwasher cleaning tablet work as well as vinegar?

For limescale, yes. Affresh and Finish tablets contain citric acid, which is comparable to vinegar. They will not, however, scrub the filter or spray arms — that part is still manual.

Can I run an empty cycle to clean it?

An empty hot cycle helps with light film but does nothing for trapped food in the filter or mineral deposits in spray holes. Mechanical scrubbing is required for a real clean.