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Dishwashing
Fact Sheet Notebook
Automatic Dishwashing Problems, Causes and Solutions
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Problem
Causes
Solutions
Preventive Measures
Black or gray marks on dishes
Aluminum utensils rubbing against dishes.
Remove marks with a plastic scouring pad and a mild cleanser.
Be sure dishes and aluminum utensils do not rub against each other in the dishwasher. This is particularly important with lightweight foil containers.