Hello -
The cause of the stains on the interior of your dishwasher may be the water. Do you know if you have hard water, water with a high mineral content? If so, do you know if the water has a high iron or maganese content?
If you have hard water in your home water supply and do not have a water softener, check the owner's manual for your dishwasher - the Troubleshooting section - to see if there is mention of stains on the interior of the dishwasher.
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From the American Cleaning Institute web page on Automatic Dishwashers:
http://www.cleaninginstitute.org/clean_living/automatic_dishwashing_problems.aspx#YellowYellow / Brown Stains
Causes:
Iron or manganese content in water supply.
Solutions:
After food soil is removed, wash dishes with citric acid crystals. Check dishwasher manufacturer's instructions for amount to use and method. Do not add detergent.
A liquid product is available to remove iron deposits from the dishwasher interior; follow the package instructions.
To retard staining, use maximum amount of dishwasher detergent to keep iron or manganese in suspension during the wash. Use a rinse additive during the rinse.
Preventative Measures:
If staining cannot be controlled, the only solution is in the installation of iron removal equipment in the home water supply.
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Some solutions to the interior staining problem recommend the addition of citric acid crytals to the covered section of the dishwasher detergent dispenser. If you do that, be sure you do not have any sterling silver or silver plate tableware in the dishwasher. (Those items are best washed by hand, anyway.) Citric acid will cause pits on sterling silver and silver plate. Note: Some dishwasher detergents and dish liquids have citric acid in their formulations - check the ingredients.
Best wishes.
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