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if it is indeed grease, I would suspect it is just grease from this recent work.

I would clean it off. If you see more show up you might check with the shop that did the work to make sure it is just excess and nothing else (although it is doubtful to be from anything else).

I hope that is helpful, please let me know if you have further questions, or if I can clarify anything for you.

Best wishes to you and best of luck with your vehicle