Handwash by soaking in warm water with a gentle fabric soap for 20-30 minutes. Gently rinse off all soap without wringing or rubbing.
Lay flat to air-dry, ideally under sunlight. DO NOT TUMBLE DRY IN A DRYER.
Do not rub or wring. Do not bleach. Steam to remove creases. Avoid machine-washing to extend the life and beauty of your sleep eye mask.