Are you lot on the pull or something
Sap consists primarily of water, along with hormones, minerals, and nutrients and the chemical reaction creates a sticky residue which if landed on paintwork and untreated can cause long term damage.
If washed correctly, thoughly and treated with claybar this will remove the bonded contamination your car has received though some severe cases have needed machine polishing to finish and refine.
Add a quality sealant and wax to help prevent this happening again.