yeah, it's why I defferentiated "air" from "wind". I wouldn't expect indoor airs w/little movement w/the outside to have much salt water whereas I'd expect much more in the outside air carried by the wind.Very much in the air (loose definition, not the scientific definition) in the form of fog and wind. I don't bother washing my car much, because the next morning the windshield is just as crusty as it was two days prior.
Almost everything not SS rusts around here, and even cheap SS does rust here. Just a matter of how quick you notice it. The "chromed" piece on my generator, less than 1 month in the midst of the mess we had here in January February.
Almost 20 years ago, my daughter's grade school science experiment tested various forms of rust protection, by getting squares of plane blade steel, treating each of the 8 squares differently, and putting a set of 8 squares in various location around the property. Something like: outside, inside the garage, in a toolbox in the garage, inside a bathroom, inside a bedroom, boxed, and I forget where else. The winning rust protection method was not something I see touted online, but was what the plane blade maker used.
Almost every sample rusted, except in the toolbox, and maybe in the bedroom.
Need to fish that study out some day.
To OP: I would not use WD-40. If I recall, it's acidic which gives it its rust cutting power for loosening items. Once the oil is gone, you'll have some acidic compound left on your metal. Maybe 3in1 if you can find it. I don't know what would be so special about duck oil but I remember rebuilding a supercharger and the foul smell from the deteriorated lubricant made me think maybe we are still using whale oil in some applications
Maybe get some floor wax, that ought to be cheap.



