You may want to try a claybar.
My wife did some spray painting in the garage next to our cars...that was when I discovered claybars. Took the spray paint off completely without damaging the original car paint.
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Of all the things I've lost in life I miss my mind the most.