I always pre-wash yardage and fat quarters. Then I iron the fabric and either put on my shelves or if a fat quarter, put into my fat quarter storage containers. When I am ready to make a quilt, the fabric is ready to cut and use. I rarely starch fabric as I assemble a quilt or other project because I like the feel of fabric without the starch. I know many quilters do not pre-wash fabrics and whatever works for others is fine for them. I prefer to work with pre-washed fabrics.