The best way to get rid of stubborn stians from tyre black, grease, road grime, tar and other wierd crap that u dun even know wat it is or came from is.........After u have washed ur car and u still have those stains use "Poly-Glaze" "BUG & TAR" remover!!!!!! It is awsome stuff its mainly used for the car body but is aslo great for removing noticable fine scratches too!!!!!!!!!!! :D :D :D