First just look and see if you can tell where it is coming from, it should get "wetter" as you get closer to the leak.
If that does not work then de-grease everything in the area, run it a little and see if you can find the leak if there is one.
Check to make sure the brake master cylinder is full and the cap is correctly installed and check the power steering fluid.
The most likely suspects are the fan control hoses and the brake hydro-boost.