Yu Zhongding (left), 73, and his cousin Yu Zhongping, 64, climb the lacquer trees to extract viscous sap in the forest of Wumeng Mountain in Bijie city, Southwest China's Guizhou province. [Photo by ...

(iSeeCars) – Tree sap can be a stubborn and sticky substance on your car’s exterior. If left untreated, it can harden, attract dirt, and even damage your car’s paint over time. This can lead to sap ...