Put the car on a lift (or have one of the horrible thieving money hungry shops put it on a lift) and inspect bushings. Check the bushings on the front suspension, everywhere you can see. Wiggle stuff around, see if there's play.

I had a truck ('03 Dakota) that I spent weeks trying to locate a squeak. It turned out that my lower control arm bushings on one side had worn completely through and we're just metal on metal. Squeak would go away when wet. Eventually found it when I was doing my ball joints and noticed the lower control arm had about an inch of play on the front bolt.

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Milan Brown 1979 240D, rebuilt OM617.952 turbo diesel, rebuilt 722.315 transmission (my only daily driver)

Instagram: @maximed93