Not a sifu but will try to answer. Here's what I'll do which is an ascending order of agressiveness.

1. Wash with shampoo.
2. Clay.
3. Spray the area liberally with an all purpose cleaner, let it dwell for a minute and rub with microfiber.
4. Paint cleaner.
5. Polish.
6. Compound.
7. Wetsand.

cheap startups, can get osren's waffle weave cloths

Find yourself some tar remover, soak a tissue or cotton ball with it and put over the sap. Don't let the tissue dry and keep it damp with the tar remover by topping up. Let it dwell for 10~15 mins. That *should* soften the sap and then gently scrap it off with your fingernails or a soft plastic (like your laminated driving license). If not soft enough repeat the soaking. If still doesn't work then you'd need to get some wet sanding paper and CAREFULLY sand THE SAP off.