I wash everything, even the precuts. No chemicals, bugs, rodents, color transfer or shrinkage wanted in my sewing room. I recently almost broke my rule. I needed a small amount of fabric to finish a binding. As a started to cut, I realized the washed piece was a full inch narrower than the unwashed one, so into the washer it went. Not flimsy fabric - Timeless Treasures Fantasia. Bugs? Last week I opened a sealed package of fleece purchased online. In it was the carcass of an ugly black bug.