Vague memory from High School was "spirit of salts" = hydrochloric acid or the dilute "muriatic acid". I`m sure Peggie will comment, it could be too aggressive for head working parts incl the joker valve. Can you bypass the tank using a Y valve and give the non tank parts a good flush? Seawater that sits gets stinky.
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BruceK
2005 Integrity 386 "Sojourn"
Sydney Australia
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