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It is not easy to determine the source of the leak. Suspect either engine-oil or CV-joint grease.

The appropriate approach is to THOROUGHLY de-grease the engine bay so it is squeeky clean.

Then monitor the area to determine specifically where it is leaking.

I like to use "Oil Eater", scrub lightly with brush... then hose it off with garden-hose.
Link to Oil Eater as example ==>
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