Diesel is the go, but you need to soak the tar for a while to soften it if it has gone hard, soak a rag in diesel and cover the hard bits for an hour or so, Regards Frank.
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I got the left side of a previous vehicle, including the wheels, sprayed with tar while passing through roadworks a while back. By the time I got it home, it had set hard.
Some metho on a rag shifted it. ;)