Put your washing machine on the gentle cycle on a warm wash and rinse temperature. The temperate should be kept the same for the wash and rinse cycles.
Pour a cup of white vinegar in while the water is filling up. After the water is about one-half full, place your sheets in alone.
Let the washing machine run its cycle and restart the rinse cycle to remove any buildup from previous use of fabric softener or dryer sheets.
Place the sheets in the dryer, after the second rinse cycle and the spin cycle have finished, without any dryer sheets.