Thinner and nail polish remover should not be used. these will remove the clear coat and paint too along with the sap. never use anything that contains alcohol.
instead of kerosene you may try petrol. tree sap, tar, grease can easily be removed by a cotton ball soaked in little bit of petrol. A few gentle rub and sap will be gone. but don't forget to wax that portion after cleaning as the wax will be removed by petrol. try it and let me know.
instead of kerosene you may try petrol. tree sap, tar, grease can easily be removed by a cotton ball soaked in little bit of petrol. A few gentle rub and sap will be gone. but don't forget to wax that portion after cleaning as the wax will be removed by petrol. try it and let me know.