deck boards are weeping sap......

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I replaced all of the horizontal 5/4 PT pine boards on my deck about 9 months ago. Let them dry out 6 or more months until this past April. Started applying solid color deck stain, and it went on just fine. No problems. About 3 weeks ago I started noticing that some sap was weeping through the stain just on a few boards and wondered what that could be from. Any ideas? Is this normal? What should I use to scrub the sap off? Turpentine or some other solvent?
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