To get the big clumps off before using the chemical agents, I have used screen door screen and a heat gun. We use solder wick at work to remove excess solder from electrical parts. It is the same principle. Just lay the screen over the sap and hit it with the heat gun. The sap will come through the screen, let it solidify a bit on top and pull it off. **Caution: Sap is flamable.
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