Ford Explorer Fluid Leak

My 1998 Explorer XLT has 170,000 miles on it. I get a full tune-up every 50k (change all the fluids and spark plugs), get the oil changed every 3,000 miles and have only had one major problem (rear differential a few years ago).

Yesterday, after I pulled into the garage, I noticed a dark fluid (brownish maybe) leaking from near the passenger-side back door. My 2-year-old had spilled a cup of tea on the way home, so I figured maybe it was leaking out. The stain was still pretty wet looking today, so I gave it a sniff and it's definitely not tea!!

At that point, I looked underneath and saw several little things along the edge of the vehicle that kind of resembled wing nuts but were more of a boomerang shape. A few of them had that same brownish fluid around them, including one on the driver's side. I noticed that the fluid around the boomerangs was sticky.

I have a repair manual for the Explorer, but I looked at the power steering and transmission sections and didn't see the boomerangs. Under the hood, the fluid levels were normal for engine oil and power steering. Transmission fluid was full, but it had been a few hours since I'd driven the Explorer.

Any help on how to fix the leaks would be greatly appreciated. I tried "tighening" the boomerangs, but the bolt/screw thing they're attached to does not appear to be threaded!

Thanks in advance.