seized pistons spinnaker pole

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Using vinegar to clean almost anything exposed to salt water works very well. Particularly when the problem area is small hard to get too parts like springs, or internal components. I would assume any acid would work, but the advantage of vinegar is that it is relatively cheap, easy to find, and mild enough that it won't etch metal or attack components.

Just ask any avid SCUBA diver about rincing equipment with the stuff.