Amelia, my blue wash out markers are by Clover. Perhaps JoAnn's or a quilt store. if not, online should work for you. always test anyway but I've never had a problem. I tend to soak my quilt in my washer, spin out and re-soak and spin. I do tend to spritz the marks out but soak later anyway. haven't located my Sew line pencil to see if one must erase or not.