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Tech's right, and I didn't consider that there is a Lithium based chassis grease out there that's the same red color. Sounds like your shop used one of the wheel bearing pressure attachments and...

Just black grease.

The red color grease sounds like Pennzoil's Wheel Bearing Grease, which is good stuff. For grease to be like a chocolate milkshake it needs moisture, seems to me. Have you had the hubs submerged, or...

I agree, I'd be looking at that brown fluid as brake fluid that's absorbed a lot of moisture from the air.