I never prewash. I just make sure that I use cold water and put white vinegar in it to keep colors from running. This is something my MIL taught me decades ago. I also put in a sheet of that Shout product which picks up any vagabond color in the water. (Can't think of the name of it right now and family sleeping so don't want to make noise opening the laundry room door. LOL)
Then I dry it on a not too hot cycle or outdoors if it is warm weather.
Then I press it IF IT NEEDS IT, using Best Press spray starch with lavender scent.