Add 1/2 lemon juice to the rinse cycle of a medium wash load. Hang your bed sheets outdoors to dry on the line.
Add 1/2 cup distilled white vinegar to the rinse cycle of a medium wash load to soften hard water and prevent the minerals turning white bed sheets gray.
Add 1/2 cup boric acid or washing soda to the rinse cycle of a medium load to brighten whites.
Mix 1 gallon hot water, 1 cup dry automatic dishwasher soap and 1/3 cup natural oxygen safe bleach in a medium sized plastic trash can. Stir the mixture thoroughly with a large plastic spoon. Place your bed sheets into the mixture and leave them to soak for half an hour without agitating them. Remove the sheets from the can and place them in the washing machine. Add your usual laundry detergent and wash them in small loads.