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While I'm not sure about cleaning away the lime I do no a little about the thru hull fitting. I had to remove and cap one a few weeks ago and was upset that I would have to spend hundreds of dollars to lift the boat. Fortunately that wasn't the case. The pressure of the water coming through the thru hull is only a couple of pounds, you can easily stop and hold it with your hand. In fact you can remove the hose and stuff a rag in the thru hull, this will reduce to the flow to just a dribble. If you are going to cap it, just leave the rag in there. Be sure to use teflon plumbers tape or other appropriate measures to seal the hoses and check it for leaks periodically after the repair.
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