I did my grill 9 months ago. I used a scotchbrite pad and scoffed it up pretty good. I did not remove the chrome just scratched the hell out of it.
Cleaned it well to get rid of the dust.
I then used duplicolor (color matched the rest of the H2). I used two big cans of each paint and clear coat (total 4 cans). It has held up GREAT!
Dont forget to the back side too. If you dont, when you are walking from the back to the front you will see chrome "line" across the hood and sides which is the thickness of the grill. Hope that makes sense.