I installed a new drive train on my bike today. Great fun. The quick link on the chain wasn't as quick as it should have been. And my hands got caked in oily dirt that I can't get completely off no matter how raw I scrub them. I hate that, people think you're an unsanitary slob, but I really, really tried to get them clean. Really. Perhaps you have to wait for the outer layer of skin that's been stained black to die and sluff off. Feels good having the new chain tho, no more skipping every time I crank on it.