Removing spray paint from hood grills
 

I spray painted my hood vents and hood grills using Dupli-Color Silver and gave it about 2 to 3 coats about a month ago. Over the past week driving through heavy rain I noticed the paint chipping off both from the grills and the vents. So I wanted to know what would be the best way to remove the paint as I want to go back to the original black color. I got some fine sand paper but looks like it's going to require quite a bit of elbow grease and also might scratch the grills.
Any tips/suggestions would be appreciated.

EDIT: Attached image of the embarrassing paint job. :(

Paint thinner.
This stuff is great too if you can find it All Purpose Chemical (Paint / Graffiti Remover) Soy Gel Paint Stripper QT

Was going to get paint thinner but was told/read that thinners will eat plastic. Is that true?

Be sure anything you use will not damage the plastic. When I need to strip paint the first thing I try is lacquer thinner because it is fast and easy. I test it first to see if it will eat the base material. Most of the time there is no problem.

You should have used an etching primer like Bulldog Bite B4 the finish coat.

Soak them in gasoline for a few days.. Then scrub.

Plasti dip them black

Thanks for your replies. I will try using a thinner in a small area and see how it works out.

I've had lots of experience with spray paint in the past ;p ...gasoline works best.. Most will shrivel off the rest just use a soft toothbrush.

I actually just did this to some Z71 badges that started to flake similarly.. 3 days in one of those disposable glad tupper ware things and barely had to put any elbow grease in... Factory chrome still on plastic.