For the middle grille, use either a hard plastic lever, or a flat blade screwdriver with its tip covered by tape, to release the grille’s perimeter thirteen clip-on tabs. There are six on the top and seven on the bottom.
To remove the bottom three-section grille, remove each of the two small outer sections by pulling its inward side away from the vehicle and pivot towards respective side of the vehicle. There is one tab on each section to lift from its slot. Each small section has a short plastic line to prevent loss if it pops free. Reach behind the bumper to compress the line’s tip and remove the section. Note: often the retaining lines are already broken off.
For the bottom grille center section, use the same pry tool to unfasten the perimeter’s nine clip-on tabs. There are four on the top and five on the bottom.