Most fabrics are treated with chemicals/insecticides to keep bugs away up to the point the consumer purchases it. Most fabrics will be shipped from the manufacturer to a distribution center, then on to a store for sale. And regardless of how clean these places are, bugs will always be an issue. I don't want to take home a brand new length of fabric and have to worry about bugs on it. I don't wash new fabrics until I am ready to cut and use (although I realize that won't work for everyone).