Originally Posted by
Ultraspontane
I'm not worried about rust, but if I had a steel bike frame that was my favorite and wanted to keep forever, I would take it to a machine shop and give it an acid bath. After the frame is clean and clear of rust, protect the inside with linseed oil, and the outside with chrome/paint. That would be enough protection for the Amazonian Rainforest.
Which he doesn't need because, beyond surface rust, frames don't rust through from occasional contact with water. Unless they've been exposed to something corrosive or left in standing water for an extended period of time, the OP really doesn't have anything to worry about.