Will Goo Gone get very hardened and dried tree sap off of car hoods and windows?

with enpough of it it might but go to yopur auto dealer an ask him for the junk they use in the body shop there its good an leaves nothing behind except the paint

body shops also use the same spray =they spray it a then leave it for for a few hours them off it comes =not sure of the name but any body shop can help you with stuuf or you can offer to buy a can from them