Google
Per Google, "Nail polish remover" or "OFF" seem to work well at removing this stuff.
A Google search of "removing tree sap from car" brought up an litany of sites.
How much did your marina charge you? Was it many hours of labor? Another option I saw on Google was to use a buff it. (Obviously knowing what your doing since inexperienced hands with a buffer on fibreglass can prove disasterous.)
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