rust??...who's got time for rust??
Randy is the only one who CORRECTLY answered the question...yep get the nibbler and the shears out or any other cutting tool you can get your hands on. After cutting the ugly out go ahead and Spot a patch in then after grinding clean and a good cleaning with a metal prep apply 2 coats of epoxy primer to both sides of the area. This serves 2 purposes, 1..it prevents moisture from creating more rust...2... it give great adhesion to your fillers. Just treat the area as you would any other repair and you should be rust free for the life of the car( only in that area...remember cancer spreads to untreated areas) Or you can just move to a high desert area and never have to deal with the stuff again!!!