Things You Will Need
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Fill a laundry tub or other container with about 4 to 5 gallons of hot water.
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Dissolve ½ cup of electric dish washing detergent into the hot water. Stir well until dissolved.
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Place curtains into the mixture, pushing down so that they are completely submerged. Allow them to soak for 8 to 24 hours, depending on how yellow they are.
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Remove the curtains to an empty bucket. It is not necessary to wring them out. Bring the bucket to the laundry room.
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Fill your washing machine with hot water, adding laundry detergent and chlorine bleach according to the manufacturer's recommendations. Add the curtains to the machine and launder as usual.