{Insert Catchy Phrase HERE}
I've used WD-40 to get gum out of all kinds of stuff, including carpet, the petroleum base really eats the gum away quickly...but then you have to use a degreaser to remove the WD-40...the earlier suggestion of SimpleGreen works really well on nearly everything (not sure about gum) but it does get engine and 5th wheel grease out of the shirts i wear at work.