Sorry hit enter too fast... 2 suggests are:
1 - iron cleaner - I buy mine at JoAnns it comes in a white and blue "toothpaste" tube. You heat up the iron, dab this on a terrycloth towel and then iron the towel.
2 - a dryer sheet - one of my friends used this she just ironed the hot iron on it. She laid it on the "edge" of the ironing board and rubbed HARD.
Hope this helps.