I mix the starch 1-1, put it in a spray bottle, soak the fabric, cover it with waxed paper and iron it until it is mostly dry, then I hang it to finish drying. I have never scorched fabric and the iron stays clean. f I wait and Iron the fabric after it is dry I can't put the pressure on it that I need to.
If the fabric is really wrinkled, I will spray it with water and press first.