Yep, I have been watching mine slowly change colour over the years. Last autumn a pheasant tried to move into one of them at speed. It also popped out a parking sensor whilst pirouetting around. Good news is I could stick the sensor back on from behind given the mesh was partially off. Bad news is that mesh fixings partially broke but glued it back in place - okish. Will replace both (parts not too expensive) but looks like bumper off as others have said.
As an aside my rear parking sensors had packed up. Got the 4 Skoda new sensors and plastic grommets, painted the sensors up and just before fitting spring arrived and the sensors started working again - Italians!