Things You'll Need
Liquid laundry detergent
Sweaters sometimes develop stiffness when washed. This happens more often to sweaters that are dried naturally rather than tumbled; but it can happen to any sweater. Using too much detergent is occasionally the culprit. When detergent is not rinsed completely it makes the fibers stiff. Sometimes sweater fibers are simply dried out and stiff due to frequent washing, however. This doesn't have to happen, There is an easy solution to keeping sweaters soft when you wash them.
Place your sweaters in your washing machine with other sweaters or towels -- avoid putting them in with zippered items -- or other clothes that may snag the sweaters or roughen the fibers.
Fill the washing machine and add liquid laundry detergent. Use only the recommended amount of detergent to avoid buildup on the sweater fibers.
Turn on the machine and let it go through the gentle wash cycle. Stop it when it gets to the rinse cycle.
Add a capful -- approximately 2 tbsp. -- of cream hair conditioner to the load. Turn the machine back on and let it finish the cycle.
Tumble dry sweaters, if the fabric allows. If the care label states you can tumble dry the sweaters, use a dryer sheet to further soften them as they dry. Otherwise, dry the sweaters flat on towels.