I have quite a lot of tar that got splattered up into the rear bumper and the front wheel wells. If I try to clay bar it out I would probably destroy the clay bar in minutes
__________________ Drive it the way it's meant to be driven! 2000 Boxster S
Then Id heat it a bit to soften then use any of the suggested chemicals that were listed. Sometimes dried tar takes time. As we say while working on a Rolls or Bentley its not a 15 min job! Be patient. Any fine surface scratches from getting off can easily be buffed out.