snap some High res/close up and in focus pics of the "sap"
hammering it with "clay" probably wont shift it if its a Big blob, will wreck the paint around it tho
Diving in with ANY sort off abrasive * Autoglym paint renovator or Meguairs Ultimate compound and a foam pad, microfiber is a sure way to risk wrecking the paint.
Rubbing "detailing spray" with a microfiber cloth on bird bombs is also a good way to wreck the paintwork.
a Simple spray bottle with Plain water, a tissue , soak the bird bomb, place tissue over the top, Soak that > leave it to soften the bird bomb, after a few (depends on weather ) mins lift n bin the wet tissue,and KEEP spraying the bird bomb till it floats n slides off the car,
no Rubbing , no marring of the paint with the solids in the bird bomb, and cheap/effective
the tree sap.
you May find a Traffic film remover softens it Or a "tar and glue remover",,
idea is to Soften it then remove it , Not bash on in with abrasive compounds and risk the paintwork,,,