so i decided to replace the wheel housing/protector in the arch above the wheel as the bottom of the bumper kept detaching and popping to the side. the corrosion prevention bit came when i took the panel of, there was loads on wet mud and leaves caught up and packed in at the bottom so even if you don't need to replace the part it would be wise to take half a hour to remove all this. just need to remove the 3 screws and the panel will pull forward enough to get to it! replacing the panel was very straight forward, there was around 8 screws to remove, then transfer the 2 clips from the bottom of the old one and slot the thing into place. i didn't need to take the wheel off but my car isnt lowered, it would of been 10 times easier with the wheel off though! the old one. once removed, this is what was packed in! below the leaves is mud and acorns! more than i thought! old&new the clips that need to be carried over. the new splash guard lined up and bolted back.