I haven't had this problem yet myself, but what I hear from others is that Neverdull polish wadding is the stuff you want to use. I tried it on the valve cover, didn't do enough to cut through the thick black tar, but it did liquify the top layer to a light oil. That should be enough to get rid of the diesel soot.
A word of caution though, don't use it indoors, or even the garage if it's attached to the house. It really stinks. And if you happen to be living with a whiney type you'll get to hear about her headache that seems to be the worst pain ever felt by a human and the choking fumes and on and on and on...
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1982 300CD Petrol/Black Leather
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