I have made several with dryer sheets - I just leave them in - they do fine in the final quilting process. I have seen posts about them causing problems with people with allergies - if you use dryer sheets, I recommend using the in the dryer four of five times, iron them between two sheets of newspaper to remove excess oils, then sew your strips onto them. I used to save mine in a basket on the dryer and when I wanted to do some blocks, I would toss all of them into the dryer with a load of clothes then iron and sew. I used Kirkland for a long time and I could get a 6" block from them (5.5" finished). I used a block that you cut in half, then added a strip of black down the middle - it made a really pretty lattice look and was super simple!