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Read up on fluidfilm. Its lanolin based rust preventative. Smells like sheep, used by navy. Non toxic and cleans up with soap, creeps into crevices. I bought their kit with spray gun and wands and treat my trucks once a year. A gallon does two SUV sized trucks including frame and door pillars. Don't bother with the aerosol cans, they don't go very far.
Seems to have stopped rust from spreading. Clean everything first to get dirt and debris off the metal.
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