- Carolyn's "Steam the heck out of it" method, and
- holding the iron about 1 inch above the fabric and steaming it.
I know this is having an effect because the fabric ripples up with the steam and straightens out slightly as it dries.
Carolyn (and others) recommend letting the fabric dry completely before moving it. This makes for a L-O-N-G project. I got almost half way through last night and could take no more! I folded the fabric in half lengthwise, accordion-folded it, and hung it from the selvedges until I can do a little more.