Terrible to see - I would try some "Goof Off"
http://www.goofoffstainremover.com/
The stuff s pretty good and states it ok for auto paint. I have used it many times before for tar / bugs / etc.
Do a small trial of it in a less noticeable spot under the rocker or somewhere for a test. Should work on the wheels too.
Good luck man.. its not the end of the world even though it may feel that way.