If you try everything that has been stated so far and it doesn't work, please contact me. My daughter just had a baby in Dec and we had a new car seat and an old one. The baby had a bowel movement and got it all over the new car seat. So I had this old car seat (all stained with the yellow stains) since I was washing the coverings of the new car seat I decided to wash the coverings of the old car seat as well. I used a wonderful product on both coverings. When I got the coverings out of the dryer, they BOTH had come out clean and like new. No stains of any kind. If you will contact me I will let you know what the product was that I used and tell you how to get it.