This is a lot easier to do with the car jacked up even on one side. Remove the 3 pop fasteners using a flat screw driver. Remove the small nut that hold the fabric in the wheel well behind the well, this will give easy access to other bolts.
Note I have aftermarket splash guard so my setup looks different. Repeat this for the other rear wheel. The wheel does not need to be removed, a short flat screwdriver will work just fine or come in from under the car.
|Remove pop fasteners|
Remove the two bolts from under the bumper behind each wheel. This needs to be repeated on each side.
|Hitch cover removed and cover screw popped open|
|Remove diffuser screws|
|Remove hidden screw|
|Not these bolts, ones that are further in.|
Remove these bolts. you can either work a 100m ratchet wrench in there or come in from the wheel well using a socket and extension.
|Remove these bolts from inside|
|Each tab must be released properly.|
|That's a lot for just 4300 miles of clean driving.|
|Time to clean and make extra drain holes in diffuser|