Does anybody have dirt that sticks to the back bumpers? I do not have rear mud guards so whatever dirt and grime comes of the back wheels sticks to the side of the bumper. I clean the truck once a week and wax and spray wax in between waxes. I used some turtle wax bug and tar remover to clean it today. It did a very average job. I have to take my ABSORBER and scratch the dirt out. Any one having this issue? What can I do to avoid this and what product works with little work to get things clean?