why your pillows turn yellow over time? And how can you restore them to their original freshness?

Regular Washing: Prevention is key. Wash your pillows regularly according to the manufacturer’s instructions. Most pillows are machine washable, but be sure to check the care label. Use a mild detergent and a gentle cycle to avoid damaging the filling.
Baking Soda and Vinegar: To remove yellow stains, create a paste by mixing baking soda with a small amount of water. Gently rub this paste onto the stained areas and let it sit for 15-30 minutes. Then, rinse thoroughly. You can also add a cup of white vinegar to the rinse cycle to help break down stains and eliminate odors.
Sunlight: The natural bleaching power of sunlight can help remove yellowing. After washing your pillows, place them outside in direct sunlight for a few hours. Sunlight can kill bacteria and lighten stains. Make sure your pillows are completely dry before using them again.
Pillow Protectors: Invest in pillow protectors. These zippered covers act as a barrier, preventing sweat, oils, and allergens from penetrating the pillow. They are easy to wash and help extend the life of your pillows.
Pillow Replacement: If your pillows are old, flattened, or the yellowing is severe, it might be time to replace them. High-quality pillows are often more resistant to yellowing due to their superior materials and construction.