And the Frixion pens are not made for fabric! Regular laundry detergent will not remove the ink from the fabric fibers. I use the blue pens on light fabrics and the Clover white pens on darks. I always wash my quilts when they are done. First you need to soak and then agitate the quilt in cold water, not hot! I spin the water out twice and then add the detergent and wash on gentle cycle. Just spritzing only makes the marks vanish, it doesn't actually remove them. If they should turn up as a faint brown mark later, wash in vinegar to totally remove.