its cosmoline.
i had it on running between all my doors like that and also found some under the hood. it is used in shipping the vehicle/body parts. it is like a wax. clean it off asap or it will harden.
you can buy cosmoline remover online/at auto stores.
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Gone but not forgotten
14 335i
12 335i 6 speed
11 328i
06 330i
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