Place an old towel or rag over the hardended wax then run the iron over the towel several times.The wax will come up off of the rug and onto the towel.
Step3
Take a clean towel and rub the spot to make certain there is no more wax. Take the old towel or cloth and either throw away or run through the washer.
Tips & Warnings
I wouldn't recommend using a paper bag for 2 reasons.
1) Paper has fibers in it and could scratch and possibly ruin your non-stick iron.