What neutralizes bad smell in yarn?

To neutralize bad smells in yarn, you can try washing it with a mixture of mild detergent and white vinegar, which helps eliminate odors. Additionally, air drying the yarn outside in fresh air and sunlight can also help remove unwanted smells. For persistent odors, placing the yarn in a sealed bag with baking soda for a few days can absorb unwanted scents. Always test a small section first to ensure the yarn's integrity isn't compromised.