I agreed with Dobes.
It's the Power Steering fluid. you must have a leak in your reservior or a bad P/S pump. It happened to mine and i was also curious about it. Until i check the fluid that's drip to the ground, It didnt smell like oil and a different color. I knew it was the Power Steering.
Check your Power steering lines to see if theres a leak there. And most of the time, It's probly a seal or the pump is bad. i need to get mine fix also