Personally i did a black Merc S550 that had some white over spray on it. it wasn't too bad but definitely noticeable. I first clayed it, (car had never been clayed) Then I used a medium/high compound with a foamed wool pad. that got it all off for me. not too sure what yours is like but try that
So I just got back from the over spray removal. Took me and my brother 4 hours for both vehicles. Claying took the overspray right out. I didnt even have to use the more aggresive griots clay. For the plastic parts had to use alot of elbow grease (not sold in stores), a little scrubbing brush & some Xenit. My client was pleased with the job & I got some advertising in thanks to all the curious neighbors lol I didnt get to take pics of overspray but here are the end results.