Hard Water and Your Kenmore Dishwasher
If your dishes emerge from the dishwasher with a white chalky film, milky cloudiness, or water spots, you are dealing with hard water mineral deposits — not a dishwasher malfunction. Hard water contains elevated levels of dissolved calcium and magnesium. When the water evaporates during the drying cycle, these minerals are left behind on glass and ceramic surfaces.
Is It Hard Water Deposits or Detergent Residue?
Soak a dish in white vinegar for 5 minutes. If the white film dissolves, it is mineral deposits. If it does not dissolve, it is likely detergent residue or etching (permanent damage from phosphate-free detergents). This distinction matters for the fix.
Solutions for Hard Water
Rinse Aid
This is the most effective and easiest solution. Rinse aid lowers the surface tension of water, causing it to sheet off dishes in thin sheets rather than forming droplets that leave spots. Ensure your Kenmore dishwasher’s rinse aid dispenser is filled. Increase the rinse aid dosage setting if spotting persists.
White Vinegar Rinse
Place a bowl with 1 cup of white vinegar on the top rack and run a hot water cycle (no detergent). The vinegar dissolves mineral deposits from the interior and dishes simultaneously. Do this monthly.
Citric Acid Treatment
For severe buildup, run an empty cycle with 2 tablespoons of citric acid powder placed in the detergent cup. Citric acid is highly effective at dissolving calcium scale.
Dishwasher Salt (European Models)
Some Kenmore models sold in areas with very hard water include a built-in water softener that uses dishwasher salt (sodium chloride). Check if your model has a salt reservoir and maintain it if present.
Preventing Future Buildup
Use rinse aid every cycle, run monthly cleaning cycles, and consider a whole-house water softener for severe hard water areas (water hardness above 7 gpg or 120 ppm).