I had an old 91 Jeep that had some rust in a few areas, I washed it out good and let it dry out then I sprayed a liberal amount of graphite on the area and wiped off the excess. Its seemed to work quite well. The vehicle was grey so it didn't even show that much.
If you don't care too much about what it looks like and just want to slow the corrosion then you could try that.
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