Why is the inside of my dishwasher discolored or stained?
WARNING!
To avoid personal injury or death, disconnect your appliance from its power source
before you start any troubleshooting or repair work. Use caution when working inside any appliance.
Depending on the color of the stain, it could be several
things causing the problem. Red, pinks, or oranges could be tomato
sauce stains. Yellows, grays, and browns are a mineral buildup. To
remove any mineral or rust stains from your dishwasher, you can try
running citric acid or a
commercial product like Glisten through your dishwasher, then rinse the
dishwasher out by running the unit again with a full cup of detergent.