Tools needed:
5.5mm socket
10mm wrench or deep socket
2 small flat head screwdrivers
Remove light shrouds using 5.5mm socket, remove grille shroud using 5.5mm socket
Remove grille bolts using 5.5mm socket, one each side.
Remove clips on bottom of front clip. Two under each light, two under center of clip. Gently but firmly pull on front of clip and they should let go, if not you can use a flat head screwdriver to press down on clips to aid in removal.
The front clips is now out, place grille on a blanket on the tailgate. Using a 10mm wrench remove the retaining nuts from the back of the oval emblem.
Now for the grille removal you'll need two small flathead screwdrivers.
Insert as shown and very gently pry and wiggle the clips and they will let go.
Start from the outsides and work your way in releasing clips as you go.
Two on each side.
Five along the bottom, center clip has tabs on both sides.
Here is two clips out.
Grille is now out.
Clean grille removing all debris on grille I used a scrubbrush and a bottle brush to clean using hot soapy water, rinse and clean with isopropyl, allow to dry.
Hang grille so that you can access all sides, using very light coats go at the grille from every angle you can to get into all crevices.
I wound up giving it 5 light coats to cover everything, I used Rustoleum for plastic it gave it a nice semigloss finish
Allow everything to set for 24 hours to cure and put back together.