There isn't anywhere you should see grease, just places it should be... and those places are sealed. Pretty much the ball joints at the ends of control arms are a metal ball and socket style joint that pivots, and the grease inside the joint is sealed in by a rubber boot. If/when the grease leaks out/drys up the joint is left unlubricated and the joint will wear and creak. It usually takes a mechanic with decent suspension knowledge/experience to isolate where the suspect noises are coming from, and the aforementioned grease needle to inject grease into the otherwise non serviceable joint which can quiet the squeak, but not reverse the wear.

As others have said though, this is just one of many places that can cause a squeak and/or rattle in the suspension.

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