I wash and dry all my fabric before it goes into my stash. I starch occasionally, depends on the pattern.
I prefer to know if my fabric is a bleeder before putting it in the quilt. I also prefer working with washed fabs. Never know what the fabric picks up between manufacturer and point of retail sale. Have read some real horror stories here but I always washed before anyway. Even before reading about bug eggs, insecticides and other harsh chemicals.