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How to Clean a Dishwasher
A dishwasher that smells, leaves dishes spotty, or runs longer than it used to has one of three problems: a clogged filter, scaled spray arms, or a moldy door gasket. All three are 15-minute fixes most owners never do because the manual says 'self-cleaning' (it isn't). This protocol covers the parts you need to clean, the monthly maintenance product, and the cleaning advice that voids dishwasher warranties (bleach in stainless interiors, vinegar in machines with rubber seals).
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0 of 10 steps completedStep-by-Step Instructions
1 Step 1: Find and clean the filter (the part nobody knows exists)
Step 1: Find and clean the filter (the part nobody knows exists)
Most dishwashers built after 2010 have a removable filter at the bottom of the tub — it catches food particles instead of grinding them up. Without regular cleaning it clogs, water can't drain, and the next wash redistributes food on your dishes. Pull out the bottom rack, twist the filter assembly counter-clockwise, rinse under hot water + dish soap + scrub with a soft brush. Reinstall. Do this monthly.
OXO Good Grips bottle brush
The narrow brush that reaches inside the filter mesh. Also for cleaning spray arms (step 3). Already in many kitchens for water bottles; works here too.
Soft detail brush set
Smaller stiff-bristle brushes for tight spots. Same as the bathroom grout brushes; works on dishwasher filter mesh.
2 Step 2: Wipe down the door gasket
Step 2: Wipe down the door gasket
The rubber gasket around the door is the second-worst gunk magnet (after the filter). Same problem as the front-load washer: food + moisture = mold. Wipe with a microfiber cloth, hot water, dish soap. Open the door at full extension and pull back the gasket folds to access the hidden side. Black gunk in the folds is mold — clean it; if it persists, you need an enzyme treatment in step 4.
Microfiber cleaning cloths (24-pack)
Same cloths used for the washing machine and bathroom mold cleans — soft, no abrasion. Dedicate one to dishwasher gasket cleaning so you're not re-introducing chemicals from other tasks.
3 Step 3: Clear the spray-arm jets
Step 3: Clear the spray-arm jets
Spray arms are the rotating arms that fling water onto dishes. Hard water scales their nozzle holes; food debris clogs them. Pull each arm off (twist counter-clockwise), rinse, poke each jet hole with a toothpick or wire to clear blockage, run hot water through to flush. Reinstall. Cleaner spray arms = cleaner dishes immediately.
Toothpicks (wooden, 500-pack)
Cheapest tool for clearing spray-arm jets and other small-holes throughout the house. Buy the bulk box.
4 Step 4: Run a hot cycle with a dishwasher-specific cleaner
Step 4: Run a hot cycle with a dishwasher-specific cleaner
After cleaning the parts you can reach, treat the parts you can't — interior tub, heating element, drain line. Use a dishwasher cleaner (Affresh is the brand most manufacturers explicitly recommend). Pour the tablet/packet into the dispenser AND in the bottom of the tub. Run an empty hot cycle. Do this monthly. Most dishwasher 'won't get clean' problems disappear after a single Affresh cycle.
Affresh dishwasher cleaner (6-pack)
The cleaner most major manufacturers (Whirlpool, Maytag, KitchenAid, Bosch) explicitly recommend in their service manuals. One tablet per monthly cleaning cycle.
Lemi Shine dishwasher cleaner
Citric acid-based — works on hard-water scale + degreasing. Less expensive than Affresh; comparable results in independent testing.
Finish Dishwasher Cleaner
Liquid form, hangs upside down inside the tub for the wash cycle. Cheap and effective; the most-stocked option at supermarkets.
5 Step 5: For hard water scale: a citric acid cycle
Step 5: For hard water scale: a citric acid cycle
If dishes come out spotty even after cleaning the machine, the problem is hard water minerals depositing on dishes during the rinse. Two solutions: rinse aid in the dispenser every cycle (cheap), or a citric acid descale once a quarter (deeper clean). For descale: empty dishwasher, fill the dispenser AND a bowl on the top rack with citric acid powder (~1/4 cup), run a hot cycle.
Finish Jet-Dry rinse aid
Standard rinse aid — fills the dispenser, lasts ~3 months between refills. The cheapest fix for spotty glasses on hard water. Auto-dispenses every cycle.
Citric acid powder (food-grade)
Pure citric acid powder. Works as descaler (~1/4 cup per cycle) and as ingredient in homemade dishwasher tabs. Also used for cast iron cleaning, so it earns shelf space.
6 Step 6: Pre-rinse less — modern dishwashers want food to grip onto
Step 6: Pre-rinse less — modern dishwashers want food to grip onto
Most modern dishwashers (post-2012) actually work BETTER with food residue on the dishes — the enzymes in modern detergent need food particles to attach to. Scraping debris into the trash is enough; pre-rinsing under running water wastes water AND makes the detergent less effective. Bosch and KitchenAid both publish this in their manuals. Scrape, don't rinse.
7 Step 7: Skip the bleach
Step 7: Skip the bleach
Bleach in a stainless-steel dishwasher pits the interior — the chlorides attack the chromium passivation layer. Plastic interior dishwashers are OK with occasional bleach but stainless is permanently damaged. Same for chlorinated cleaners. Use Affresh or Lemi Shine, both of which are formulated for dishwasher interiors.
Bleach in a stainless-interior dishwasher
Warning: Chlorine bleach pits stainless steel — the damage is irreversible and shows as gray-black flecks in the tub. Manufacturers (Bosch, KitchenAid, Miele) explicitly void warranties for bleach damage. Use Affresh or citric acid for descaling — chlorine is not the right chemistry for a dishwasher interior.
Bleach as a 'deep clean' for the dishwasher tub.
Vinegar in a Bosch or Miele dishwasher
Warning: Bosch and Miele service techs report rubber seal damage from repeated vinegar use — same chemistry as the front-load washer. Occasional vinegar is fine; monthly is risky. Use citric acid or Affresh for routine descaling. Save vinegar for occasional use.
DIY descale with white vinegar.
8 Step 8: Adjust water temperature at the water heater
Step 8: Adjust water temperature at the water heater
Dishwashers need 120-130°F water to clean properly. If your hot-water heater is set to 110°F (common for energy savings), the dishwasher never gets hot enough — grease doesn't dissolve, detergent doesn't activate, dishes come out gritty. Either: turn the water heater up to 120°F (also kills Legionella bacteria), or run the kitchen faucet hot for 30 seconds before starting the dishwasher (to flush the cold pipe water).
Infrared thermometer (water temperature check)
Point-and-shoot thermometer — verify your hot water at the kitchen sink is 120°F+ before assuming the dishwasher has a problem. Cheap diagnostic.
9 Step 9: Use the right detergent — and the right amount
Step 9: Use the right detergent — and the right amount
Liquid detergent has been the wrong answer since ~2015 — modern dishwashers are designed for pods/packs. Powder is the cheapest with similar performance. NEVER use Dawn or regular dish soap (the kind for the sink) — the suds overflow the dishwasher and flood the kitchen. This is the most-photographed kitchen disaster on the internet.
Cascade Platinum Plus dishwasher pods
Pre-measured pods with built-in rinse aid and grease remover. Best-tested by Consumer Reports. Most modern dishwashers are designed around pods.
Finish Quantum Ultimate Pro pods
Finish's premium pod — comparable to Cascade Platinum, slightly cheaper. Best on hard water.
Regular Dawn dish soap in a dishwasher
Warning: Sink dish soap is HIGH-SUDSING. A teaspoon of Dawn in a dishwasher produces a foot of suds that overflows onto the kitchen floor. There are no exceptions — never substitute sink soap for dishwasher detergent.
Substituting sink dish soap when you run out of dishwasher detergent.
10 Step 10: Set a monthly cleaning calendar
Step 10: Set a monthly cleaning calendar
Every dishwasher problem resets to easy mode with monthly maintenance: filter clean, gasket wipe, spray-arm flush, Affresh cycle. 15 minutes monthly. Most dishwashers that 'died' at year 5 actually died because the filter clogged the drain pump after years of no maintenance — fixable for $0 by anyone who'd read the manual.
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