By far the best thing to do is NOTHING! ...no CLR, NO SCOTCHPAD...
It all depends on the look you are after. If you check out at the link I posted, the majority of my truck was almost beyond surface rust. In my opinion coarse rust and corrosion are not patina, they are examples of severe decay. Paint and metals burnished from use, chips, light dents, scratches and mild oxidation are the patina that most are looking for.
Personally, I'm sort of put off by the current state of my own truck. I'd eventually like to repaint it, which I'll have to do after taking care of the body work anyway, and wear the paint down a bit to knock some of the shine off. Not saying I want a matte paint job, I just want it to look like a well used and well cared for truck.
BTW, I painted and "aged" the top and visor on mine to match the body. Spray paint, sandpaper and a handfull of rocks. I found the trick to weathering paint is to do several coats of different colors after priming, then hit it with paper and other abrasives to take down the surface and finally use a power sander with fine paper to wear thru to the other colors.
http://farm8.staticflickr.com/7125/7676712288_86704da1e1_k.jpgI'll try to get some better pics asap. Unfortunately she's up on stands while I blast and powder coat the wheels.
