Speaking of "Ospho" there is also a helpful product called "Oxpho Blue" (pretty sure they're unrelated) that's great for treating hardware, especially nuts and bolts that will be exposed to the elements. It's a cold-blue solution that comes in a very small bottle but you dilute it so a little goes a long way. I keep two mason jars in my garage, one with evapo-rust in it and one with Oxpho ready to go. I usually don't reuse hardware if it's standard stuff, but some things are hard to find (or expensive) so if they're in good condition, they get a bath in evapo-rust, washed/rubbed clean, a dip in rubbing alcohol to drive off any remaining water, then cold-blued.
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1981 F-250 Custom. 6.6L V8, 4 barrel Holley carb, ARA aftermarket A/C.