My backyard is very sticky and the glass top table is always dirty is this from my Oak trees I also have a Horse Chestnut.
The paper below says that when oak trees are producing sap from their twigs, it from a disease known as Oak curculio. Now this paper seems very credible, but I cannot seem to find any information on Oak curculio. I would try calling a local gardening shop and asking them if they know anything about the disease.
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