Are you going to replace the burrs? It would seem with all that mis-use and gunk, new burrs would be a good thing. Hard to tell the old burrs condition. Enjoy that grinder. You earned it.
I'm wondering this myself...My doser could sure use a deep cleaning, if I can just toss it in the dishwasher, that would be great. I wouldn't have expected that it would have been good for it though...
I'd recommend breaking it down afterward as I found grounds packed up under areas that I doubt the dishwasher would reach when I cleaned mine. The ratchet mechanism is coated with grease so I would suggest recoating that area.