Removing Bumper

spray the heck out of them with some penetrating oil for a couple days....If they are real rusty, when you take them off, as you loosen them up, loosen them maybe 1/2 -3/4 turn then tighten again and go back and forth, loosen and tightening them and spraying with more penetrating oil and gradually working them off. This seems to work well and keeps them from breaking and/or stripping.