Richard, (Worcester, MA)
Richard, try this. Realizing that some petroleum products may be harmful to EPDM rubber roofing if it becomes saturated, carefully moisten a clean, soft, cotton cloth with regular mineral spirits and lightly rub the pine sap from the roof. Do not pour the spirits directly onto the roof, but use a clean portion of the cloth each time. Eventually you should be able to remove all of the pine pitch. Though not always 100% necessary, apply an EPDM protectant to the affected area after removing the pine sap. And don't park under that pine tree any more!