I also struggled with the chain. For me, I swapped the chains (tandem) out and am still soaking the moon dust ones in kerosene. Really for no more reason than I had an old can of kerosene laying about. I also have an ultrasonic cleaner (in the box) I was thinking of busting out. Haven't decided what fluid to fill it with.

For me, it was the hubs. Really bad in there.