I had the same thing happen to me so I called one of the experts in my quilt guild. She told me to take a brown paper bag and sprinkle on iodized salt then run the hot iron over it. I tried it and it worked perfectly, but I then had to shake the iron around a little to get the salt out. I liked it because it was something I had around the house and didn't have to go 30 miles to a quilt shop to buy something special for the clean up. I was back to quilting in about 15 minutes.
Angie