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If it is like a Mustang's plastic grill, I was going to do mine with Meguiars Ultimate Protection and a tooth brush
Major pain in the neck and the longevity isn't that great. On a similar grill I used the aerosol Meg's Accent Dressing, now discontinued. I still see the aerosol Trim Detailer around, always thought it was the same product, just smells a little different. Good for 2 - 3 months if you want to keep it looking new.
TL
I'd use a spray product -- as I'm way too impatient to clean/dress by hand (would take hours). Stoners Trim Shine or Duragloss Ultimate Detail Spray should work well. Once conditioned back to black, you could protect with AquaWax monthly/bi-weekly.
A spray tire foam may even work...just do it before washing the rest of your vehicle.
(I'm assuming this is the black honeycomb grille)