Hard Water Deposits

• Hard water, which is high in minerals such as calcium and magnesium, leaves behind a white, scummy film on surfaces. Homes with hard water are more prone to filmy buildup on shower doors, rings around the toilet and cloudy dishware. Homeowners sometimes install water softener systems to soften water in the home, reducing hard water deposits. Commercial conditional rinses are available to add to your dishwasher to help eliminate this problem.
  
  

Water Temperature

• Perhaps the spots on your dishware are from dishwasher soap that failed to fully dissolve during the wash cycle. This can happen if your water temperature is too low. Some dishwasher manufacturers recommend water temperatures about 120 degrees F.
  
  

Detergent

• Water temperature is not the only reason you might be finding detergent residue on your dishes. You may be using too much detergent in your dishwasher. Check with your dishwasher manufacturer to verify the property detergent amount. Another consideration is the age of the detergent: a fresh detergent dissolves more effectively. When storing your dishwasher soap, keep it in a cool, dry area.
  
  

Water Pressure

• Low water pressure can interfere with your dishwasher's ability to manage the dishwasher soap and clean the dishes. If the dishwasher is not working properly due to low water pressure, this may create a problem with white residue spots on your dishes. Consult with your dishwasher manufacturer for the recommended water pressure for optimal results, and if necessary, consider adding a booster pump to the water supply to increase the water pressure.