Distilled white vinegar is my initial cleaning solution of choice. It works pretty well, especially if you have time to soak things. 1 and 2 gallon jugs of the stuff are available at most warehouse stores.
Not a rigging application, but if shower heads start to clog up from mineral deposits an overnight soak will return them to like-new condition.
I soaked rags in vinegar and wrapped them around salt-caked turnbuckles for several hours. A fresh water flush cleaned everything off, allowing them to be backed off, further cleaned, lubed, and reassembled.
Are there issues with acid and stainless?
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