Do not overload the washer and fill the drum evenly, so it doesn't create an unbalanced load. Select the correct cycle and spin speed depending on the type of clothes you're washing and double-check ...

Wool dryer balls can become matted and stiff, attract lint, or grow mildew. Clean old dryer balls to revive them and extend their lifespan until it's time to replace them.

Wool dryer balls reduce static cling and help the laundry dry more quickly and evenly. Over time, all that bouncing around with wet clothing causes dryer balls to become matted, felted, and stiff.