These hubs look fantastic.
Was that "only" dirt and old grease on that rear-hub, or was the chrome actually peeling off?
Bubbling, peeling and completely peeled off in places Andy... did look worse than they actually were tbh. Very pleased with the outcome for sure. 
I always thought that once the chrome is peeling, re-chroming would be the only way to save it in most cases. But that obviously depends on the metal underneath the chrome finish.
A while ago I tried to polish a dull spot on a side wall of my 7x's that had a tiny of peeling too, but it didn't work that well.