Go to a bicycle shop and get a can of bicycle cleaner..the water soluble citrus degreasers. These products work like majic. I use Pedros "Oranj Peelz Citrus Degreaser".

Mark

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1984 300TD Wagon, 407,800 mi (current daily driver)
1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)