How to remove duct tape residue?

I RECENTLY PURCHASED A P.O.S CAR AS A BEATER TO GET BACK AND FORTH TO WORK. THE REAR DRIVER SIDE WINDOW WILL NO LONG STAY ROLLED UP. DURING THE LAST RAIN SEASON MY DAD DECIDED THAT AS A QUICK FIX HE'D DUCT TAPE IT UP TO HOLD. WELL NOW THAT THE WEATHER IS WARM THE TAPE HAS COME OFF AND THERE IS A THICK LAYER OF... show more I RECENTLY PURCHASED A P.O.S CAR AS A BEATER TO GET BACK AND FORTH TO WORK. THE REAR DRIVER SIDE WINDOW WILL NO LONG STAY ROLLED UP. DURING THE LAST RAIN SEASON MY DAD DECIDED THAT AS A QUICK FIX HE'D DUCT TAPE IT UP TO HOLD. WELL NOW THAT THE WEATHER IS WARM THE TAPE HAS COME OFF AND THERE IS A THICK LAYER OF RESIDUE LEFT ON THE INSIDE OF MY WINDOW. DOES ANYONE HAVE ANY INEXPENSIVE WAYS TO REMOVE IT WITH NO DAMAGE?
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