Wanted to ask if this has happened to any of you before. When I finished working on my latest effort of FMQ the other day, I noticed that there was a residue the same color as my backing fabric on the edges of my sewing machine where the fabric moved across. It came off with some elbow grease and a bit of WD-40. But I was just wondering if any of you have had this happen when you are machine quilting? I was thinking perhaps it might be better to wash the fabric first to get the sizing or whatever it is out and perhaps it would go more smoothly as I am sliding it around. Any thoughts?