I didn't read all the comments on this post so I apologize if this is a repeat solution. I make liquid starch in a bucket and dip fabric into it, hang it on the clothes line till damp dry and then press it.
1. wash fabric, removes chemicals and excess dye
2. dip in starch, make a 50% solution of liquid Niagra starch, squeeze out excess starch
3. damp dry it on the cloths line, or portable, rigged spot over bathtub.
4. press it, if too dry spritz with water
I don't like spray starch, it gets every where and empty cans are not recyclable.
peace