We cover cleaning up rusty tools here on a regular basis, and having been here several years I notice that I rarely see anyone suggest using the bench grinder with a wire wheel to clean rusty tools as I always suggest, which I find very surprising. I could not imagine cleaning many of my old tools that I have a thoroughly as I have using any other way! I could make the set shown above look virtually new within minutes using my method!
I find the wirewheel too aggressive for a lot of cleaning. I do use it on stuff that is really far gone, but always try other methods on things that still have some original patina.