Quick answer
Rust spots on cutlery from your dishwasher are often caused by hard water or a faulty detergent dispenser. Check your water hardness and ensure you're using the right detergent. Clean the dispenser and rinse aid to prevent future spots.
Confirm the symptom
- Rust spots appear on stainless steel cutlery after washing
- Spots are reddish-brown and flake off easily
- Only occurs in the dishwasher, not by hand washing
- Spots appear even with proper rinsing
Tools and prep
- Rubber gloves
- White vinegar or citric acid
- Soft cloth or sponge
- Clean towel
- Distilled water
- Dishwasher-safe container
- Turn off the dishwasher power at the circuit breaker
- Shut off the water supply to the dishwasher
Step-by-step troubleshooting
- Check Water HardnessDo: Test your home’s water hardness using a test kit from a hardware store.Observe: High mineral content in the water.Means: Hard water can leave mineral deposits that oxidize and appear as rust spots.Next: Use a water softener or add vinegar to the dishwasher.
- Inspect Detergent and Rinse AidDo: Check the type and amount of detergent and rinse aid being used.Observe: Using too much detergent or incorrect type can leave residues.Means: Improper detergent can cause mineral deposits and spots.Next: Switch to a high-quality detergent and rinse aid designed for hard water.
- Clean the Detergent DispenserDo: Remove the dispenser and soak it in a mixture of equal parts water and vinegar for 30 minutes.Observe: Mineral buildup dissolves and dispenser is clean.Means: A clean dispenser ensures proper detergent and rinse aid distribution.Next: Reinstall the dispenser and run a test cycle.
- Clean the Dishwasher InteriorDo: Run an empty dishwasher cycle with a cup of vinegar or a dishwasher cleaner on the hottest setting.Observe: Suds and residue are removed from the interior.Means: A clean interior prevents mineral buildup and spots.Next: Wipe down the interior with a soft cloth after the cycle.
- Check for Rust in the DishwasherDo: Inspect the dishwasher’s interior for any signs of rust or corrosion.Observe: Rust spots on the dishwasher’s interior or components.Means: Rust inside the dishwasher can transfer to cutlery.Next: Replace any corroded parts or the entire unit if necessary.
- Adjust Cutlery PlacementDo: Rearrange cutlery to ensure it is not touching the dishwasher’s interior or other utensils.Observe: Cutlery is spaced out and not in contact with metal surfaces.Means: Proper spacing prevents direct contact that can cause rust transfer.Next: Run a test cycle to see if spots persist.
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Hard Water Mineral deposits from hard water can oxidize and appear as rust spots on cutlery. | Common | Easy | Water softener or vinegar |
| Improper Detergent Using the wrong type or excessive detergent can leave residues that attract minerals. | Common | Easy | High-quality detergent |
| Faulty Rinse Aid Dispenser A clogged or malfunctioning rinse aid dispenser can lead to poor rinsing and mineral buildup. | Sometimes | Easy–Medium | Rinse aid dispenser |
| Rust Inside Dishwasher Corrosion inside the dishwasher can transfer to cutlery during the wash cycle. | Sometimes | Medium | Dishwasher parts or unit replacement |
| Incorrect Cutlery Placement Cutlery touching the dishwasher’s interior or other utensils can cause rust transfer. | Sometimes | Easy | Cutlery rack adjustment |
| Low Water Temperature Insufficient water temperature can prevent proper cleaning and rinsing, leading to mineral deposits. | Rare | Medium | Water heater adjustment |
| Overloading the Dishwasher Overloading can restrict water and detergent flow, leading to poor cleaning and spots. | Rare | Easy | None |
Parts matching
If you need to replace parts, look for these common components:
- Water softener or vinegar for mineral buildup
- High-quality dishwasher detergent for hard water
- Rinse aid dispenser for proper rinse aid distribution
- Cutlery rack for proper cutlery placement
- Dishwasher cleaner for interior cleaning
When purchasing parts, ensure they are compatible with your dishwasher model.
When to call a professional
- Rust spots persist after following all troubleshooting steps
- You notice rust or corrosion inside the dishwasher
- The dishwasher’s water temperature is consistently too low
- You suspect a major component failure or need a water softener installation
- You are unsure about the correct parts or procedures
FAQ
Can I use regular dish soap in my dishwasher?
No, regular dish soap is not designed for dishwashers and can create excessive suds and residue. Use a detergent specifically formulated for dishwashers.
How often should I clean my dishwasher?
Clean your dishwasher at least once a month with a vinegar or dishwasher cleaner cycle to prevent mineral buildup and maintain performance.
What is the best way to test water hardness at home?
Use a water hardness test kit available at hardware stores or online. Follow the instructions provided with the kit to determine the hardness level of your water.
Can I use lemon juice instead of vinegar to clean my dishwasher?
Yes, lemon juice can be used as a natural alternative to vinegar for cleaning your dishwasher. Run an empty cycle with a cup of lemon juice on the hottest setting.
Why do my dishes still have spots after using rinse aid?
Spots may still occur if the rinse aid dispenser is clogged or the rinse aid level is too low. Clean the dispenser and ensure it is filled with the correct amount of rinse aid.