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I was re reading all the suggestions and I believe it is not tar. I am pres of our Boro and in charge of our streets and we use a crack filler that is some type of synthetic mixture in place of tar and once dry cannot be removed. If that's the case id try 1500 or even 2000 grit wet/dry paper and water and carefully try to wet sand it off. With 2000 its pretty hard to go through the clear coat. When I do chip repairs I fill them in let dry and the paint repair is then standing much higher then the original finish. I wet sand usually with 2000 sometimes 1500 to knock it down then 2000 to blend then I machine buff it all even. This system may be your only recourse if you have tried all the chemicals that do not eat paint as it appears you already tried.
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