This is the best product to get your curtains stiff. Just wash your item like usual and then hang to dry. Spray starch to cover and let air dry. Miraculously turns material into stiff fabric. Good for collars and hems too.

I always use this Easy On when I iron our clothes.
It takes and keeps the wrinkles out plus there's no sticky residue afterwards.
All clothing come out crisp and nice.
This speed starch is excellent, and I like to use it when I can!!

This speed starch for an iron is really good because it helps me get crisp cotton and linen clothing everytime. It is really easy to apply as you simply just spray it.