Hello,
I often thought of using starch. I was advised by a quilting group to use something called Magic Sizing. It has left no residue. It adds a light body,no stiffness. It is great for fabric that has been washed and has hard to remove wrinkles. One spray and once or twice over the fabric works great for me. It is also good if you need to fix an oops, you know? stretch and straighten a block slightly off.
Oh,before I forget. I buy it at Walmart with the other starchs for .93 cents or at the Dollar tree for a dollar. It comes in a light blue can.
Hope this helps.
Christina (chrissy)B