Tree Sap Solution.
Chemicals such as "Bug & Tar" or mineral spirits will somewhat work for tree sap that has not dried yet. However, when it dries it hardens because it is a resin. Once it has dried the only way to get it off is with physical force.
I got the dried up tree sap off of my Xterra with a plastic snowboard wax scraper. Do not use a metal scraper on your vehicle, but use a metal scraper to clean the sap/wax from the plastic scraper. Then, polish and carnuba wax.
Dakine.