The Bloke On Who Wants To Be A...
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For more on marking an answer as the "Best Answer", please visit our FAQ.You could try white spirit, or even lighter fluid (great for loosening grease of all kinds � just remember it�s highly flammable!). Whatever you use, give it a little time to �work in�, and then scrape away what you can before applying some more.
WD40 might also be useful for breaking down the gunk. If fact, there used to be a product called Gunk, which was for cleaning greasy engine parts � I have no idea if it�s still available but that could also be what you need. Ask at a car parts supplier.