Krylon!
My damn airbrush wouldn't work and I had no time to dismantle it and clean it (painted at midnight when I had to leave at 5 am for the race).
I did, however, scuff it and clean it as usual with warm soapy water and rinse and dry it thoroughly.
The crash that removed most of that paint was when a car infront of me spun around on the straight and I had nowhere to go and hit him head on at full speed. my car did a "dukes of hazzard" off the front of his car and I landed on all 4 wheels and kept goin!