I took the dent gaurds off of me doors and all went well. Except for the fact that when I took the one off that is behind the passenger door has this thick residue. I want to say that it is wax but I don't know. i have headed it up, used bug and tar remover, and a whole lot of elbow greese. Anyone have any suggestions?? By the way you can't even tell the others were ever there.