I did not want to wait too long for the tar spots all over my car to harden as online delivery of special anti-tar stuff would have taken many days as i did not find it in a few accessory shops nearby. i researched online and majority said diesel is safe to use. So used it to clean all windows and entire car and all the tar spots melted away with a few wipes. then i washed car with a car shampoo to get the diesel residue off. turned out very cost effective too Now need to wax the car this coming weekend as the diesel would have cleaned up everything including any wax coating(not that it anyway lasts in the dusty NCR).