I somehow got chicken poop on the back of my pants, and without realizing it was there, I sat on our nice (and expensive) quilt. We rinsed it out right away and my husband used stain remover. (I think Spray N Wash.) It left two round, yellow stains where the poop was that look like urine stains. DH tried washing and treating again, but it hasn't helped. Any ideas on how to remove set in poop/urine stains from a cotton quilt? Thank you!