I have an MXD with all our data organized and displayed with the appropriate symbology, that took quite some time to make. It is used as the basic map that a number of people use here and customize for their own purposes. However, there is a strange "artifact" that seems to exist in one spot. It is an old polygon of some data that has been since updated. It will show up in the map regardless of whether all the data is turned off or not. Even if all the data is removed, it still persists. I tried selecting it, thinking maybe it was some label turned to annotation but the "delete" in the right click menu is greyed out. It seems deleting the data frame will remove it, but remaking this mxd would be more trouble than just dealing with the artifact.
How can I get rid of this?