After washing mine, I use a leaf blower to get all the water out of the cracks and hiding places. There is a lot to wash on these old trucks, plenty more then the slab sided new stuff. Use the best car washing soap you can afford, if it has wax in it, all the better. I also use WAX-AS-YOU-DRY, you mist it on while wet, one panel at a time. It just adds a layer of protection, and keeps you from waxing all the time. My daily driven truck gets waxed twice a year, but beads up water year round from the misting spray.
https://www.eagleone.com/wax-as-u-dry There soap is really good to.
