I'm with the pre-washers...if you have that much trouble with ironing the fabric smooth, it seems to me it would just be quicker to throw it all in the washer, get the sizing, etc. out of the fabric, throw in the dryer so any shrinking that's going to be done is over with. After drying, or even before it is quite dry, remove and press. Of course you can't do this with tiny precuts, but I even wash fat quarters. I use my quilts, so they will eventually get thrown into the dryer. I want any shrinkage to occur before I cut the fabric, not after it is in the finished quilt.