As a young mother of a newborn, in a sleepless state of exhaustion, I accidentally washed a pile of laundry that I had hidden a prenatal vitamin (containing DHA fish oil) in it in my jeans pocket. My underwear then smelled TERRIBLE! I've tried washing them multiple times with different detergents, baking soda, vinegar, baking soda, and vinegar. I've tried soaking and nothing has been able to remove the smell from my laundry. I read about and tried the Febreze In-Wash Laundry Odor Eliminator on the forums. WOW! Finally got rid of the smell! I only had to wash my clothes once with this product and it worked like magic eliminating the lingering odor that had been in my clothes for several weeks. It has a fresh, clean aroma, unobtrusive. I was also pleased with how well it removed the baby poo smell from my clothes. The perfect solution to remove old laundry odors!