Well, I think gear oil is harder to wash off than sheep oil. On a related note, years ago in Virginia Beach, I used to see a ,formerly white, older 240D. I say "formerly" because the owner had sprayed the cars exterior with some preservative like 'cosmoline' to which all this road dust had stuck, making his car a mottled gray-brown color. People used to write "wash me" and other comments with their fingers, on his car!

Happy Motoring, Mark

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DrDKW