Alcohol works well as mentioned however after you soften it with one rag, you need to wipe the residue off with another clean rag otherwise it just softens and spreads the sap out.
However I just finished using Purell Hand Sanitizer to take off about 50 marks on a black finish. This worked even better. Just a small drop on the sap, wait a few seconds and rub it with your finger, then a clean rag. Works great.
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