75% used conventional motor oil, 25% marvel mystery oil in a spray bottle..you might have to do a little work to find one that will spray it, maybe add a little mineral spirits to thin it down a little bit. From inside the cab, spray down in the cab corners..from outside, spray behind the rockers as best you can, every little screw, bolt, and drain hole you can find underneith, the drain slots between the inner and outer bedsides at the fenderwells, all the seams where the bed supports touch the bed..There are more, I just can't think of them or how to explain them..I usually do it once every 1-2 years..I dont usually thoroughly wash the undercarriage, so it doesn't demand treatment more than once a year..Also, any spot that is actually starting to scale, if you scrape the loose scale off and spray it, it wont get any worse as long as there is a film of oil on there. Though, some areas scale and rust from both sides, and somtimes the back is really hard to get to...Its best to spray it when its very warm outside, preferably 80* or hotter..heat makes the oil spread to all the little tiny nooks and crannies..
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