Place 2 cups of white vinegar in a bowl on the top rack of an empty dishwasher and run the hottest cycle — the vinegar dissolves mineral deposits and soap scum throughout the interior. Follow with half a cup of baking soda sprinkled on the tub floor and a short hot cycle to deodorise. Run these two cycles once a month, always separately, and clean the filter by hand first. Total hands-on time: under 10 minutes.
Quick Summary
- Step 1: Bowl of vinegar (2 cups) on top rack → hot cycle
- Step 2: Baking soda (½ cup) on tub floor → short hot cycle
- Never: Run vinegar and baking soda together in the same cycle
- Also required: Hand-clean the filter first; wipe door gasket manually
- Frequency: Monthly (every 3–4 weeks in hard water areas)
What White Vinegar Does in the Dishwasher
White distilled vinegar is acetic acid in solution. When heated and dispersed through the dishwasher's spray arms, it:
- Dissolves mineral deposits — calcium and magnesium from hard water that create the white chalky film on the tub walls, spray arms, and heating element
- Breaks down soap scum — detergent residue that builds up over time and reduces cleaning effectiveness
- Kills most mould and bacteria — the acidity inhibits microbial growth throughout the tub interior and drain
- Reduces odours — by eliminating the biofilm that causes most dishwasher smells
What vinegar cannot do: it does not reach the filter (must be hand-cleaned), the door gasket folds (must be wiped manually), or spray arm nozzles blocked with solid debris (must be cleared with a toothpick). And it cannot fix any mechanical issues — drain problems, pump failures, or broken spray arms still require service.
What Baking Soda Adds
Baking soda (sodium bicarbonate) is mildly alkaline and works differently from vinegar. In the dishwasher, it:
- Neutralises odours that vinegar alone may not eliminate
- Provides a mild abrasive action on tub walls when tumbled by spray water
- Removes any residual vinegar smell from the previous cycle
The two-cycle approach — vinegar first, then baking soda — is significantly more effective than either product used alone. The key is to run them in separate cycles. Combined in the same wash water, they neutralise each other immediately and lose both their cleaning and deodorising properties.
Before You Start: Clean the Filter
Running a vinegar cycle on a clogged filter is like mopping a dirty floor without sweeping first. The filter captures all the food particles from every cycle — if it is full, the cleaning cycle circulates that contaminated water through the tub. Remove the filter, rinse it under warm water, and scrub with a soft toothbrush before running any cleaning cycle. See our complete dishwasher filter cleaning guide for step-by-step instructions.
Step-by-Step: Clean a Dishwasher with Vinegar and Baking Soda
Empty the dishwasher completely
Remove all dishes, racks are optional but leaving them in is fine. Check the bottom of the tub for any large food pieces and remove them manually. Both cleaning cycles work best in an empty machine.
Place vinegar on the top rack
Pour 2 cups (500ml) of white distilled vinegar (5% acidity — standard grocery store vinegar) into a dishwasher-safe bowl or measuring jug. Place it upright on the top rack. Do not pour vinegar into the detergent dispenser — it will be released at the wrong point in the cycle.
Run the hottest, longest cycle
Select the hottest wash cycle available — a Heavy, Pots and Pans, or Sanitize cycle if your machine has one. Hot water activates the vinegar's cleaning action and ensures it reaches all interior surfaces through the spray arms. Do not add any detergent. The cycle will run for 1 to 2 hours depending on the setting.
Sprinkle baking soda on the tub floor
Once the vinegar cycle is complete, open the door and let the tub cool for 5 minutes. Sprinkle half a cup (approximately 100g) of baking soda evenly across the bottom of the tub. Close the door — do not mix with vinegar at this stage.
Run a short hot cycle
Select a short or quick wash cycle on the hottest setting. This distributes the baking soda through the spray system, deodorises the tub walls, and removes any remaining vinegar smell. This cycle takes 30 to 45 minutes.
Wipe the door seal and edges
Spray arms and wash water do not reach the door gasket, the door edge, or the frame around the opening. Dampen a microfibre cloth with a 1:1 vinegar and water solution. Wipe all around the door gasket, pulling the rubber folds open to clean inside. Wipe the door interior and control panel. Dry with a clean cloth.
Boost the result for very hard water: Add a rinse aid dispenser refill when you clean monthly. Rinse aid prevents water spots by reducing the surface tension of water during the final rinse — especially effective in Toronto's moderately hard water. It also helps the drying cycle work more efficiently.
Do not use bleach in a stainless steel dishwasher. Chlorine bleach corrodes stainless steel tubs and permanently damages the finish. If your dishwasher has a stainless interior, stick to vinegar and baking soda. Bleach can be used in plastic tub dishwashers only — and never mixed with vinegar, which produces toxic chlorine gas.
When Vinegar Is Not Enough
Vinegar and baking soda handle routine maintenance well. But they cannot resolve:
- Mechanical drain problems — standing water after the cycle indicates a drain pump or hose issue
- Blocked spray arm nozzles — remove spray arms and clear each nozzle hole manually with a toothpick
- Deep grease buildup in a neglected machine — a commercial dishwasher cleaner tablet (Finish, Affresh) is more aggressive and better for the first deep clean
- Error codes or electronic failures — call a certified technician
- Water leaking from the door or base — gasket, door latch, or pump seal issue
Frequently Asked Questions
Yes, white distilled vinegar (5% acidity) is safe for dishwashers when used correctly — placed in a bowl on the top rack, not poured directly into the detergent dispenser. The dispenser is designed for detergent and may trap vinegar, causing it to release at the wrong point in the cycle. Avoid using cleaning vinegar (10% acidity), which is too strong for rubber seals.
No — run them in separate cycles. When vinegar and baking soda combine in the wash water, they neutralise each other into water and carbon dioxide, losing their individual cleaning properties. Run the vinegar cycle first, then run a separate short baking soda cycle.
The vinegar and baking soda cleaning cycle should be run monthly. In hard water areas like Toronto and the GTA, where mineral deposits build up faster, run it every 3 to 4 weeks. If your dishwasher has developed a persistent odour, run the cleaning cycle immediately and then weekly until the odour is gone.
Vinegar cannot clean the filter (must be done by hand), does not reach the door gasket or hinges (must be wiped manually), and cannot remove heavy grease buildup or solid food debris from spray arm nozzles (which need manual clearing with a toothpick). It also does not address mechanical issues like a failing pump or blocked drain.
If odour persists after a vinegar cycle, check these areas: the filter (likely clogged with food — must be removed and hand-washed), the drain hose (food debris accumulates in the loop or connection point — may need professional service), and the door gasket (food trapped in the folds — clean manually with a damp cloth). Persistent odour after addressing all three areas suggests a drain issue.
Commercial dishwasher cleaners (Finish Dishwasher Cleaner, Affresh Dishwasher Cleaner) are formulated to break down biofilm and grease more aggressively than vinegar, and are a better choice for deep cleaning a neglected machine or one with severe odour. For regular monthly maintenance on a well-maintained dishwasher, vinegar and baking soda is equally effective and far less expensive.
Call a certified technician if the dishwasher fails to drain, water leaks onto the floor, the door latch is broken, spray arms are cracked or non-rotating, or the machine displays error codes. Our $89 diagnostic fee is waived when you proceed with repair, and our technicians service all major brands across Toronto and the GTA.