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Boeshield T-9 was originally developed with Boeing for lubricating and protecting aircraft components, and that same formula works well on the hinges, latches, hitch parts, and other hardware around an RV that see rust and corrosion from weather exposure. Spray it on, let it work, and wipe off the excess.
Useful well beyond the RV too, from bike chains to tools to marine hardware, anywhere rust and corrosion are a problem.