THE MOUNTING BRACKETS!!!!
a lot of people complain about removing them, because its super easy to wreck them.
I found a way to remove them easily without an issue, see the mounting brackets are studded to the metal on the body of the car, the good news is, the stud is a plastic one, so what you can do, is get a SUPER skinny flat head screw driver, insert it between the mounting backet and the metal of the car right above one of the studs (there are two, one on both ends of the bracket) take a hammer, and hit the screwdriver so it breaks the stud, should free up that side instantly, do the same for the other side of the stud, so you get your mounting brackets with open holes on either side (the stud will fall out).
When you mount the skirts on your car, just go to any auto parts store or home improvement store and get some short metal tapping screws, and a bottle of RTV, use the RTV on the metal tapping screws, so when you put the brackets on your car, it makes a nice seal to keep from rust forming.