Bill,
I used a product called "Right Stuff" bought at Advance that seemed to work well. I haven't put the truck in an outside environment as of yet. I put it in a spray bottle and sprayed away after I cleaned as best I could. I then primered/painted. In the bed rails I've heard of soaking a sock in cleaner/primer/paint and pushing thru or tying on a string/rope and pulling thru. Good luck. Are you ready for old man winter?
Dan
