I work in the marine industry and Fertan is the best rust treatment I have come across but it is not necessarily cheap. It seeps into crevices and will dry. Should it become damp it's chemical properties will reactivate and it will carry on doing what it is supposed to. If it is good enough for anchor chains it is more than adequate for the Harley.
https://www.amazon.co.uk/Fertan-Trea.../dp/B005HDY3TY
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