Bluteddi, I did the same thing--the muslin I bought must be made of steel. No matter what I do, can't get the wrinkles out. I also bought a lot of it---hmm, maybe that's why it was on sale at LQS. I'm going to try the vinegar method; I've done everything but lay it on the road and drive over it.
Thanks for the suggestions and for posting this thread, Nolee..