$60 total - a bargain, considering how much time you'd have to spend scrubbing (not to mention costs for supplies) doing that the hard way. I scrubbed the cases a bit with simple green before going in for vapor honing, just to get the main crud off. Gave it to the vendor as shown attached. I don't plan on any clear coat. The surface is smooth and a periodic wipedown is all it will need to stay looking good. My vehicles, in general, are immaculate. I will not allow 40 years worth of crud to accumulate, which was the fate of these cases prior to this teardown!
-MKL
