Clothesline Fresh Laundry Sour is a liquid laundry sour designed to neutralize the pH of the finished wash to a level which will not irritate skin. Maintaining proper fiber pH is important, not only for comfort, but will also prolong the life cycle of the washed fabric. Removal of excess alkalinity helps to minimize the graying or yellowing of fabric as well as to reduce fiber stress which can lead to potential fiber damage.