Alcohol, specifically methyl hydrate is the best choice to remove pitch. The newspapers use resin based inks and use nothing but methyl hydrate. It also mixes with water so will draw water out of wood. Mix an ounce of mh and water together and shake. Put it in a bowl and light it. It will burn to nothing without leaving even a film. I use the stuff to take pine pitch out of my drum sanders belts. Nothing else works and it is fast even on the burnt stuff.