There is a company that sells a acid based flush that removes the buildup, but I always worried what else it would "eat" while working on the salt (e.g. head gaskets). The product was shown on ship shape several years ago. Maybe you can find a reference for it there
Kamikaze
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74 V20 CC with a 150 Johnson (Gone but not forgotten)
89 V20 Cutty with a Tower (Build in process)
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