I like to pre-wash. Throw in a couple of Shout Color Catchers--they work wonders. Instead of starch for ironing, I use Mary Ellen's Best Press. Yes, I know it's a bit pricey, but I much prefer it to starch which can sometimes leave residue on fabric. I've been told that Best Press can be diluted (half water and half Best Press) and still does a great job. I haven't tried this, yet. Never mix pre-washed and unwashed fabric when making the quilt top as they will shrink differently when you wash the quilt and can cause puckering or bunching on the quilt. I also use Color Catchers when I wash my quilts--saves a lot of heartache.