It's incredibly easy to remove the grilles. I just did it this weekend.
Upper grille: Remove two torx screws at top corners. Near top center there are two clips, push them and it lifts right out.
Fog grilles: Pull. They just snap out.
On my Rabbit with no fog lights, the passenger side fog grille has a screw in it, right in the center, directly visible. Why would they stick a screw dead center right in the face of it?
Lower main grille: According to my searches here, it just snaps out like the fog grille.