Well this is another update on my trials of getting chalk out of my fabric. I tried the Shout one more time and actually put my sample through the wash in a fabric bag. Again the blue came out totally and the yellow stayed. Next I tried OxiClean Max force spray. I followed the directions. I waited 5 minutes and the blue faded so did the yellow. I reapplied more of the cleaner and waited another 5 minutes. The blue came out the yellow was still slightly visible. I then reapplied and let it dry into my fabric. When it was dry I put a little more on my scrap piece and threw it back into my bag and washed it in the washing machine. Put it through the dryer and checked it. The yellow is so faded that you would have to be looking for it to find it. Now I am going to finish binding "my hearts blocked" in quilt and give it the same treatment. Yes on gentle wash and medium heat till damp dry in the dryer. Will post pictures and results when finished.