Lots of great advice above ^^^^^
I have never seen 91% isopropyl alcohol, but then, I haven`t looked for it either..

I may need to see if I can find it..
Coming from 11 years in the Pacific Northwest where tree sap falls down from the air in abundance, I have used Goof Off Professional, in that little metal can, sold at Home Depot in the Paint Section, with Q-Tips, and removed probably lbs of tree sap and artillery fungus, safely from paintwork..
My process is to get the end of the Q-tip soaked in the product, put it on the tree sap, see if it will move or come off, and then as I take the Qtip off, immediately blot the spot with a clean white cotton towel..
I do this very carefully and accurately, and have never damaged paintwork then, or long term...
Also agree with the advice to keep away from those dang conifer trees.. Or if you cant, perhaps get a good car cover that will take the hit for you, and actually keep the vehicle a lot cleaner to boot...

Good Luck !
Dan F