Some saps are actually going to polymerize and bond to the surface (resinous saps). Best to just let them wear off. Most saps will disolve to some extent in turpentine or Naptha, cheap if you need to do a large area - you can buy formulated products like goo gone for more money. The WD-40 would also probably work, test a small section.
Bent Shaft Canoe Paddles
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