Petroleum jelly should soften it, a little lighterfluid/kerosene. Then clean the area well.They are held on by double sided tape. You can get some at auto parts stores sniff, around at body shops they might give you a little piece. I would put it on the emblem and then slightly trim back from the edge I dont think you got much of a bargain on E-bay, at MB they come with the tape installed. I would be happy they did not steal the hood ornament or star in rear, it was a fad for a while.