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Those plastic grates go down to the drain. You just need to clean out the dishwasher to prevent this staining from occurring. There is a product called Dishwasher Magic which you can pick up at Lowes or order online. Run an empty cycle without any dishes inside and put the bottle of Dishwasher Magic in as instructed on the bottle. Run a cycle with this product and that will clean everything out inside your dishwasher including the drain and that should also remove the brown stains.
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