Things You Will Need
Avoid using natural soaps when cleaning red-stained plastic; it only sets the stain further, making stain removal more difficult.
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Set the plastic out in direct sun for an entire day. The sun will often bleach out the stain.
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Sprinkle baking soda on the plastic. Add a little water to make a paste. Let it sit for 30 minutes. Scrub the baking soda on the red stains until they disappear. Wash as you normally would.
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Fill the container with 1 part bleach and 3 parts water. Allow it to sit for about two hours. Rinse well.
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Fill the plastic container with hot water. Drop in two denture tablets and allow it to sit overnight. Wash as usual.
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Apply a cleaner made to clean coffee pots. These cleaners are formulated to remove stains from coffee pots and will remove red stains from plastic as well. Add about a tsp. of the cleaner to the container, fill with hot water and let sit overnight. Wash as usual the next morning.