Many think that the sticky substance falling from a tree is sap. It is however honeydew, a sticky substance that's produced by aphids (small insects) feeding on the leaves of the tree.
Large infestations of these insects can cause honeydew to fall onto anything beneath it.
There is no practical treatment to prevent honeydew, even the use of pesticides is ineffective.
During a period when honeydew is a particular problem, a simple but effective way of protecting your car is to regularly wash it or park it in another safe location or use a car cover.
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