Waste canvas needs to have all of the sizing washed out to be able to remove. I usually just through mine in with the wash and dry it just like you would intend to wash and dry your quilt after it is finished. Once your project is completely dry, settle back in a comfortable chair. Starting at one of the corners, start pulling each thread loose of the stitching. I use a pair of tweezers to get a good crip. After all of the threads have been pulled out, you will see that your cross stitch picture is stitched onto fabric with out any lines. If you have wrinkles, feel free to iron them. It will be easier to incorporate into your quilt pieces that way.