How to get bluing stains out of polyester fleece?

Okay, so dumb. I used bluing to whiten the baby's clothes and didn't think about the fleece. Apparently the fleece kind of sucks it up. The bottle says to soak in a mixture of ammonia and water overnight. I've done that for a total of three days. Nothing. I'm now trying boiling water and that's not working--at least not quickly. Any clue what to do?