well grommitt this is the attachment i would start with.
http://www.dremel.com/en-us/attachme...=66408&I=66415
then choose the drums with the grit that looks the closest to the rough area you want to romove and then get all the finer ones from that.
if you decide to use this wheel make sure to use a light touch and keep moving or you will wind up with a rippled up mess. best of luck mate.