hi, what is the gum on? my cleaning book(spotless) suggest dry cleaning fluid used with a cotton wool ball, then talc to absorb it. rub it in circles it suggests. You could also try tea tree or eucalyptus oil. Its a fabulous book and has never failed me yet. I bloody hate gum, my daughter wanted to be Verruca salt and put it behind her ear over night, she has hair like Carrie Bradshaw and it took my poor husband 2 hours to get out with peanut butter. good luck.