I think they do come out. They are clicked in the front and rear bumper. Try to pull them softly off the bumper. Make shure that they are not to cold. Dont do this in verry cold temperatures. The plastic mechanisem may break.
I tried it once with the strips on my frontbumper and it worked. (didnt pulled them off all the way.)
That is what other poeple told me when I asked them about removing those strips.
the black strips just pull out, infact they are very easy to pop out.
Place your fingers under one and thumb on the top and just sort of lift up with a bit of a tug and they just come out.
I take them out when I polish the car so they dont get covered in the stuff. That must tell you how easy it is to do.