My go-to tool for reclaimed wood is the Porter Cable Restorer with the Stainless Steel Wire Wheel Attachment. It does a great job of removing dirt, loose wood particles and other accumulations on reclaimed or other wood, while leaving the natural features on the wood (saw marks, grain, etc.). The surface left behind is pleasant to the touch, quite clean (though staining that is deep in the wood will remain), and have a very natural appearance that doesn't have to undergo special drying after washing with any liquids.
For dust collection I use a shop vac / Dust Deputy combination connected to the tool, though a full-size dust collector with hose attachment can work too. You can operate the Restorer without dust collection but, depending on the condition of the wood you are cleaning, you will find a LOT of dust and debris on the floor, driveway or wherever you decide to work. I highly recommend using dust collection (notably the shop vac / DD combo) and it does a great job of gathering the particles as they are removed.
With the reclaimed wood I process, I typically remove the nails and such from the wood, cut out sections that are deteriorated, badly deformed or overly filled with nails, mark nail pieces that I am unable to remove (broken below the surface, etc.) with a circle of chalk, then run the Restorer on all surfaces. I then cut the wood into sections that are easy to store or to dimensions that I will be needing for a project.
I have used the Restorer / Wire Wheel on quite a few boards and it is holding up very well - definitely worth the cost. There are likely a variety of videos on YouTube of the Restorer in action.